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Traditional method

Salted Mushrooms

Солёные грибы (solyonyye griby, Russian) · Salted mushrooms · Salt-cured mushrooms · Salt-preserved mushrooms · Brined wild mushrooms · Salted milk caps · Salted milkcap mushrooms · Солёные грибы (solyonyye griby, Russian) · Соленые грибы (solenye griby, Russian, without ё) · Грибы солёные (griby solyonyye, Russian) · Солёные грузди (solyonyye gruzdi, Russian, salted milk caps) · Грузди (gruzdi, Russian, milk-cap group) · Рыжики солёные (ryzhiki solyonyye, Russian, salted saffron milk caps) · Волнушки солёные (volnushki solyonyye, Russian, salted woolly milk caps) · Холодный посол грибов (kholodnyy posol gribov, Russian, cold salting) · Горячий посол грибов (goryachiy posol gribov, Russian, hot salting) · Квашеные грибы (kvashenyye griby, Russian, fermented mushrooms) · Соленые грузди по-алтайски (solenye gruzdi po-altayski, Russian, Altai-style salted milk caps) · Suolasienet (Finnish) · Suolatut sienet (Finnish) · Suolarouskut (Finnish, salted milk caps) · Rouskujen suolaaminen (Finnish, salting milk caps) · Rouskujen liuossuolaus (Finnish, brine salting of milk caps) · Hapatetut sienet (Finnish, fermented mushrooms; distinct process) · Sūdyti grybai (Lithuanian, salted mushrooms) · Rauginti grybai (Lithuanian, fermented mushrooms; distinct process) · Soolatud seened (Estonian) · Hapendatud seened (Estonian, fermented mushrooms; distinct process) · Grzyby solone (Polish) · Grzyby kiszone (Polish, lactic-fermented mushrooms; distinct process) · Mushrooms in salt brine

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Salted mushrooms are a traditional wild-mushroom preserve, especially of Finnish and Russian milk caps, made by layering boiled mushrooms with coarse salt or keeping them under brine, and kept cold.

A clear glass jar of cooked milk-cap mushrooms layered under brine, illustrating Finnish-style salted mushrooms.

What it is

Salted mushrooms are edible mushrooms preserved with dry salt or a salt solution. They are associated with northern and eastern European woodland food traditions, where seasonal harvests are stored for use outside the mushroom season. In Finland the general name is suolasienet; suolarouskut are salted milk caps. Russian solyonyye griby means salted mushrooms and covers a wider range of fungi. Gruzdi, ryzhiki and volnushki are groups of milk caps traditionally prepared in different ways. The finished product may contain whole caps, pieces or mixed mushrooms. It is usually a preparation intended for later cooking or seasoning rather than a complete dish.

The most characteristic Finnish ingredients are milk-cap mushrooms in the genus Lactarius. The Finnish Food Authority recognises haaparouskut, including Lactarius trivialis and Lactarius utilis, kangasrousku or Lactarius rufus, and karvarousku or Lactarius torminosus. These mushrooms can contain strongly acrid substances and require species-specific preliminary boiling. Other edible milk caps, including Lactarius deliciosus and Lactarius deterrimus, have different flavour and treatment requirements. Russian traditions also use mushrooms called gruzdi, which may include Lactarius resimus and related white milk caps. Russula species, boletes and other edible fungi appear in regional salting traditions. No single botanical species defines the entire product.

There are two principal physical methods. In dry salting, mushrooms are packed in layers with salt, often beneath a weight. Moisture drawn from the tissues dissolves the salt and produces brine. In immersion salting, the mushrooms are placed directly in prepared brine. Preliminary treatment can include cleaning, soaking, boiling and cooling, depending on the species and local practice. Some Russian methods include herbs, garlic, currant leaves or other aromatic materials, while Finnish recipes can be relatively plain. A weight helps keep the mushrooms beneath the liquid surface, but it does not prove that the product has become microbiologically safe.

Salted mushrooms are not necessarily fermented; the heavy-salt Finnish method is not. Heavy salting and refrigerated storage primarily preserve through lowered water activity and suppression of microbial growth. Other regional methods deliberately allow lactic acid bacteria to produce acid, yielding a sour fermented mushroom. The 2019 review of mushroom fermentation explicitly distinguishes lactic fermentation from acidification with added vinegar.

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History

Nobody can date the start of mushroom salting. Levshin's detailed instructions show it was an established practice by the early nineteenth century. Salt preservation is ancient, but that does not prove when people first applied it to wild mushrooms in Finland or Russia. A clear printed Russian reference appears in Vasily Levshin's Russkaya povarnya, published in 1816. It describes salting gruzdi, volnushki and ryzhiki in wooden tubs, alternating mushrooms with salt and pressing them under a weighted wooden cover. Other passages distinguish mushrooms boiled before salting from saffron milk caps salted in their own expressed liquid. The account also distinguishes these methods from vinegar pickling and drying.

Finnish mycological literature documents the importance of salted acrid milk caps during the twentieth century. A 1967 article in Karstenia names Lactarius torminosus and Lactarius trivialis as key mushrooms preserved by salting, for sale and for the home. The Finnish Mycological Society continues to describe salting as an old preservation technique, especially suitable for acrid milk caps. It also notes the drawbacks: a lot of salt, and soluble nutrients lost in the boiling and the later desalting. This contrasts with more recent household preferences for freezing and other preservation methods.

Ethnographic fieldwork provides evidence of how traditions changed and how people distinguished mushroom types. Olga Belichenko interviewed 25 Seto and 34 Russian inhabitants of Pechory District in Pskov Oblast during 2018 and 2019. Participants distinguished boletes, russulas and milk caps through local terminology, appearance, texture and culinary preference. A commonly described hot-salting method involved preliminary boiling in salted water followed by prolonged maturation, locally called fermentation. One Seto participant described layering cooked russulas with blackcurrant leaves and dill and recalled her mother's preference for avoiding garlic because she associated it with faster fermentation and spoilage. These are interview accounts, not measured fermentation experiments.

A 2024 Lithuanian ethnomycological study found that traditional salting and fermentation had largely given way to pickling and freezing, especially as labour-intensive preparation of bitter Lactarius species became less popular. Ethnographic research among Hutsul communities on the Ukrainian-Romanian border likewise documents salted and fermented mushrooms, alongside a shift toward freezing after freezers became more accessible. Beyond Europe, a 2013 Tanzanian study recorded mushrooms kept in supersaturated brine around Kigoma–Uvinza, where local salt production made it possible. These examples show geographically separate preservation practices rather than evidence of one shared historical recipe.

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How it works: microbes, enzymes and chemistry

The principal preservation mechanism in heavily salted mushrooms is the reduction of water activity. Microorganisms require accessible water for growth, and dissolved sodium chloride reduces the amount available to them. Salt also creates an osmotic gradient between mushroom tissue and the surrounding liquid. Water moves out of the cells, dissolves salt and produces a concentrated brine. In dry-salted mushrooms this liquid forms gradually under pressure; in immersion salting it is supplied from the beginning. The salt concentration within the final food depends on mushroom moisture, the quantity of salt, added water and losses during processing.

Salt affects different microorganisms differently. Many spoilage organisms are inhibited as salinity increases, but some salt-tolerant bacteria and yeasts can persist. Heavy salting, combined with cold storage, can strongly restrict microbial activity without producing appreciable lactic acid. In a genuine lactic fermentation, lactic acid bacteria consume available fermentable carbohydrates and produce organic acids, primarily lactic acid. This changes both acidity and flavour. Mushrooms generally contain different carbohydrate mixtures from vegetables, and their available fermentable sugars may be limited. A review of mushroom fermentation describes historical processes in which sugar, whey or sour milk was added to encourage acidification.

Milk caps contain latex-bearing tissues and a range of species-dependent compounds responsible for their sharp, peppery or burning taste. In certain edible northern species, preliminary boiling in abundant water and discarding the liquid reduces unwanted acridity. The mushrooms also contain cell-wall components including chitin and glucans, which contribute to their characteristic firm and sometimes brittle texture. Boiling, salting and later soaking change tissue hydration and release soluble compounds. These steps make correctly identified species palatable; they do not neutralise every mushroom toxin. Identify the species before processing.

A 2024 study fermented Lactarius deliciosus with selected lactic acid bacteria, using 3% salt and 2.5% sucrose brine, and monitored the resulting pH. A separate study of button mushrooms found that dry salting alone failed to produce reliable lactic acid fermentation, while an inoculated brine supported much greater acidification. These experiments concern particular ingredients and cultures, not universal household methods. Even a low measured pH is only one safety parameter. Inadequately controlled moist, low-acid mushrooms can present serious hazards when stored without oxygen, including the potential for botulinum toxin formation. Safe storage depends on validated combinations of acidity, salt, temperature and packaging.

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How it is made and why each step matters

The Finnish Mycological Society's dry-salting method begins with edible milk caps that have been positively identified, cleaned and cut into manageable pieces. The society specifies 4–5 litres of preliminary boiling water per kilogram of mushrooms. The mushrooms are brought to a boil and cooked by species: about five minutes for haaparousku, ten minutes for the more acrid karvarousku and kangasrousku. The Finnish Food Authority independently specifies five minutes for haaparousku and ten minutes for the other two named species. The cooking liquid is discarded, the mushrooms are rinsed thoroughly in cold water, and excess water is drained or pressed out. They must cool thoroughly before packing.

The prepared mushrooms are then layered tightly in a clean glass or food-safe plastic container with coarse salt. The Finnish Mycological Society gives 100–150 grams of salt per kilogram of prepared mushrooms, with a salt layer on the bottom and top. A clean cover and weight keep the mushrooms compressed. Salt draws liquid from the tissues until brine surrounds the contents. The society instructs the maker to keep the container in a cold cellar, refrigerator or chilled room, checking that every mushroom remains beneath the brine. If more liquid is required, it specifies additional brine made by dissolving 100 grams of salt in one litre of water, boiling it and allowing it to cool. No universal numerical storage temperature or maturation period is supplied in that recipe.

Finnish household organisation Martat publishes two related methods. Its traditional dry-salting version uses 150–180 grams of salt per kilogram, with optional garlic, dill and blackcurrant leaves. Its separate immersion-brine method uses 100 grams of salt per litre of water. In the latter, prepared mushrooms are briefly heated in the brine before being packed hot into clean jars, which are then kept at 5°C. That is a chilled brine-preserved food, not a shelf-stable canned one.

Russian methods vary further. The 1816 cookbook describes weighted wooden tubs, mushrooms layered with salt, and different treatment for gruzdi, volnushki and ryzhiki. A modern Altai account describes soaking selected milk caps before layering them in a prepared cedar barrel with salt and aromatic leaves. The Pechory ethnography records hot-salted russulas allowed to mature for at least a month and a half. These observations document traditions, not universal safety instructions. The Japanese Ministry of Agriculture describes dry-salt and immersion-brine techniques in general, but its referenced page principally covers salted seafood rather than an authenticated Japanese milk-cap preparation.

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Regional and historical variations

Finnish suolasienet are mostly acrid milk caps. The Finnish Food Authority recognises haaparouskut, kangasrousku and karvarousku as food mushrooms when correctly prepared. The traditional approach is to boil the mushrooms, discard the water and preserve the cooled material with substantial quantities of salt. Some households layer mushrooms directly with coarse salt, while others use prepared brine. The Finnish Mycological Society and Martat document different salt concentrations and methods, showing that there is no one universal national recipe. The resulting mushrooms are often desalted before being made into a creamy mushroom salad. Freezing is now a common alternative for mushrooms that do not need salting to remove their acridity.

Russian traditions include both cold and hot salting. Cold salting generally involves packing suitably selected mushrooms with salt without a preceding full boil, sometimes after soaking; hot salting includes preliminary boiling or scalding. The correct treatment is species-dependent. The 1816 Russian cookbook distinguishes gruzdi, volnushki, ryzhiki and other mushrooms, with preparations involving wooden tubs, salt, weights and occasionally aromatic herbs. The Altai version documented by Slow Food uses a cedar barrel, preliminary soaking, currant leaves, dill, garlic and other seasonings. It reports 50 grams of salt per kilogram of mushrooms during packing, far less than the Finnish heavy-salt method.

Seto and Russian residents described different attitudes toward boletes, russulas and milk caps, often valuing texture after boiling and salting. One method packs cooked russulas packed with herbs and allowed to mature for at least one and a half months. In Lithuania, interviews documented the decline of salting and fermentation as freezing and vinegar pickling became more common. Hutsul respondents near the Ukrainian-Romanian border similarly described salted and fermented Lactarius deliciosus and some Russula species, alongside other preservation methods.

Research in Tanzania documented salt drenching of wild mushrooms around Kigoma–Uvinza, where salt production was locally available. Japan's agriculture ministry separately distinguishes dry salting from immersion brining, explaining their different effects on water movement and storage.

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How it is eaten

In Finland, salted milk caps are commonly used in sienisalaatti, a mushroom salad made from prepared mushrooms, onion and a dairy-based dressing. The Finnish Mycological Society names salted milk caps as especially suited to this dish. Because the preserve contains substantial salt, the mushrooms are normally rinsed and soaked in cold water, with the water changed when necessary, or briefly boiled and rinsed to remove excess salinity. They are then drained and chopped before being seasoned. The finished salad is served cold, including at festive meals. The salting process provides a stored ingredient; the onion and dressing belong to the later serving recipe rather than the original preserve.

Russian solyonyye griby are served as cold appetisers, often called zakuski. Regional preparations may include onion, garlic, dill, sunflower oil, sour cream or other accompaniments. They can be eaten alongside boiled potatoes, rye bread and other savoury foods. The 1816 Russian cookbook already distinguishes salted mushrooms intended for cold dishes from mushrooms preserved by vinegar or drying. Later Russian culinary writing documents chopped salted mushrooms dressed with vegetable oil during fasting periods or sour cream when dairy foods are permitted.

Texture is part of the appeal. Properly prepared russulas and certain milk caps can remain relatively firm after boiling and salting, providing a contrast to soft potatoes or creamy dressings. The Pechory fieldwork records that people prize mushrooms that stay crunchy. Salted mushrooms may also be incorporated into fillings, soups and cooked dishes after appropriate desalting, although the amount of salt retained varies with the duration of soaking and the mushroom's size. A recipe using salted mushrooms should therefore not assume that the ingredient has the same seasoning strength as fresh mushrooms.

Lactic-fermented mushrooms offer another flavour profile, with microbial acidification adding sourness beyond the taste of salt. The Lithuanian study documents mushroom salads with sour cream and traditional cooked mushroom dishes, while research among Hutsuls records salted and fermented mushrooms among winter provisions. These accounts do not give one universal serving formula.

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Reading results and problems

A successfully prepared high-salt mushroom preserve should contain correctly identified, suitably pretreated mushrooms kept under their brine in cold storage. The mushrooms may become firmer or change colour as salt redistributes water and preliminary boiling alters the tissue. The Finnish Food Authority notes that haaparousku may develop a slight greenish colour during boiling and that this change is normal for the identified species. The Finnish Mycological Society emphasises complete submersion and replenishing brine if necessary.

The Finnish Food Authority states that some acrid milk caps require preliminary boiling because they contain compounds that can cause nausea. It specifies five minutes for haaparousku and ten minutes for kangasrousku and karvarousku. These timings apply to the named species, not to every wild mushroom. Lactarius helvus, lakritsirousku in Finnish, is mildly poisonous and is not collected for food. Tokyo's food-safety authority warns that salting, soaking or drying cannot make a poisonous mushroom edible.

Lactic fermentation needs a real drop in pH from microbial acid; waiting a set number of days does not show that it happened. The World Health Organization identifies inadequately preserved low-acid mushrooms as a potential vehicle for foodborne botulism. Salt, acidity, refrigeration and water activity must be controlled as part of an appropriate validated process. The Finnish recipes need cold storage and are not canning instructions.

The initial salting ratio also needs correct interpretation. The Finnish Mycological Society's 100–150 grams of salt per kilogram is applied to prepared mushrooms, not necessarily one kilogram of fresh mushrooms before boiling and draining. Martat separately documents a traditional method using 150–180 grams per kilogram and an immersion-brine method using 100 grams per litre of water. Salting and later desalting can also remove nutrients and contribute to excessive dietary sodium if the mushrooms are not adequately prepared before serving. In Finland, the Food Authority warns that some wild mushrooms may contain radiocaesium-137; boiling or soaking and discarding the water can reduce it under specified conditions.

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History

Vasily Levshin's Russian Cookery (Russkaya povarnya), printed in 1816, gives instructions for salting gruzdi, volnushki, ryzhiki and other mushrooms in wooden vessels with salt, weights and cold storage, separating boiled mushrooms from those salted raw. That is a firm printed record, not the start of salting. Finnish professional literature describes milk-cap salting in the twentieth century, and recent ethnographic studies record living traditions among the Seto and Russians of Pechory, in Lithuania and elsewhere.

Ingredients

Scaling: salt scales at 100 to 150 g per kilogram of prepared mushrooms.

Fresh edible milk-cap mushroomsPositively identified haaparousku, kangasrousku or karvarousku, cleaned of debris and cut into manageable pieces
1 kg
Reference quantity per kilogram; the preserved yield is not given. The three species need different boiling times.
Water for preliminary boilingClean potable cold water
4.5 L
4 to 5 L per kilogram of mushrooms. Discard it after boiling; never reuse it as the brine.
Coarse food-grade saltCoarse salt suitable for preserving; salt at the bottom and the top
Amount not stated
100 to 150 g per kilogram of prepared mushrooms. It is not stated whether the mushrooms are reweighed after boiling and pressing.
Water for optional supplementary brinePotable water, boiled with the salt and cooled
1 L
Only if needed to keep the mushrooms covered; the total volume is not given.
Coarse salt for optional supplementary brineDissolved in the 1 L of water, boiled and cooled
100 g
100 g per litre of starting water, not a measured final brine strength.

Method

Risks and precautions · High risk
Poisonous or incorrectly identified wild mushrooms

Wild mushrooms contain edible, unsuitable and poisonous species that may look similar. Salting, soaking or boiling does not make every poisonous species safe.

Hazard source
Inadequate pretreatment of acrid milk caps

Certain edible Finnish milk caps contain acrid constituents capable of causing nausea or gastrointestinal symptoms if improperly prepared. Required boiling times differ by species.

Hazard source
Uncontrolled microbial growth

Salt concentration, available water, temperature and contamination determine microbial growth. A traditional salt quantity and the formation of brine do not prove that the product is commercially sterile or free from pathogens.

Hazard source
Botulism from improperly preserved mushrooms

Low-acid mushrooms stored under unsuitable oxygen, salt, acidity or temperature conditions can present a botulism hazard. Salt preservation should not be treated as validated home canning.

Hazard source
Mushrooms emerging above the brine

The Finnish Mycological Society instructs that the mushrooms remain completely covered by brine. Exposure of the upper material to air may encourage surface deterioration.

Hazard source
Excessive dietary sodium

The prescribed quantity of salt is high. The Finnish Mycological Society explicitly notes the nutritional disadvantage of heavy salting and advises desalting before consumption.

Hazard source
Contaminated mushroom collection sites

Wild mushrooms can accumulate contaminants from their growing environment. The Finnish Food Authority advises against collecting near polluting industrial sites, heavily trafficked roads and contaminated urban areas.

Hazard source
Radiocaesium-137

Some forest mushrooms in areas affected by radioactive fallout may contain radiocaesium. Its concentration varies by location and species; preliminary boiling or soaking can reduce it when the treatment water is discarded.

Hazard source
Loss of preservation after desalting

Soaking, rinsing or briefly boiling the mushrooms before use removes some of the preserving salt. The desalted mushrooms should not be treated as equivalent to the original concentrated preserve.

Hazard source

Use only positively identified edible milk caps for which the selected Finnish preparation is appropriate.

Control source

Use abundant water for the documented preliminary boiling method.

Control source

Apply the correct preliminary boiling time to the named edible species, then discard the cooking water.

Control source

For the Finnish Mycological Society's dry-salting method, layer mushrooms with the documented quantity of coarse salt.

Control source

Keep all mushrooms compressed beneath the preserving brine.

Control source

If necessary, prepare supplementary brine using the source's formulation and add it after boiling and cooling.

Control source

Keep the preserve in cold storage and inspect its condition and brine level.

Control source

Remove excess salt before serving by soaking with changes of cold water or by briefly boiling and rinsing.

Control source

Do not use this high-salt preparation as a substitute for a tested pressure-canning or shelf-stable mushroom-preservation method.

Control source

This follows the Finnish Mycological Society heavy dry-salting method; it is not a Finnish-Russian composite and not an authenticated Russian cold-salting formula.

A mushroom kept in brine has not necessarily fermented; the word fermented in an interview is not a measurement.

Do not reduce the salt to the lower amounts used in some Russian regional methods without a validated method.

A cold cellar is not the same as a refrigerator unless you have measured its temperature.

Do not use other wild mushrooms in place of the named Finnish milk caps without species-specific preparation guidance.

Boiling cannot make every toxic mushroom safe. Never use an unknown specimen.

Do not keep mouldy or deteriorating mushrooms because they were heavily salted.

Not a canning method: do not seal it in jars at room temperature.

Desalting changes the salt concentration; desalted mushrooms are perishable.

For a true lactic ferment of mushrooms use a separately documented, safety-validated process.

  1. Use only positively identified edible milk caps for which the Finnish pretreatment is appropriate. Discard deteriorated, wormy or dirty ones, clean off forest debris and cut the mushrooms into manageable pieces. Salt does not make a poisonous mushroom edible.
  2. Put the mushrooms in cold potable water, 4 to 5 litres per kilogram, in a pot big enough to keep them surrounded by water.
  3. Bring to the boil and boil haaparousku for about 5 minutes, or kangasrousku and karvarousku for about 10 minutes. These times are for these species only.
  4. Pour into a colander, discard all the cooking liquid and rinse the mushrooms well with plenty of cold potable water.
  5. Drain thoroughly, press out the excess water and let the mushrooms cool completely before salting.
  6. In a clean glass or food-safe plastic container, put a layer of coarse salt on the bottom, then a layer of cooled mushrooms. Keep alternating, pressing the mushrooms down tightly.
  7. Use 100 to 150 g of coarse salt per kilogram of mushrooms, spread through the layers, and finish with a layer of salt. Do not cut the salt to the lower amounts used in some Russian traditions without a separately tested method.
  8. Cover with food-safe plastic film and set a clean weight on top, for example a thoroughly washed stone sealed in a plastic bag, to keep the mushrooms pressed under the brine.
  9. Keep the container cold, in a cold cellar or refrigerator. No numerical temperature is given. Do not leave it at room temperature to mature.
  10. As the salt draws water from the mushrooms, check that they stay completely under the brine. If there is too little liquid, add boiled, cooled supplementary brine made with 100 g salt per litre of water.
  11. Keep it cold and submerged. No maturation period, final salt level or shelf life is published.
  12. Before serving, take out what you need with clean utensils and soak it in cold water, changing the water, or boil it briefly and rinse it well, to remove the excess salt.
  13. Drain the desalted mushrooms and use them, for example in Finnish mushroom salad. Desalted mushrooms are perishable; do not put them back in the preserve.
  14. Throw out any batch with unexpected mould, an off smell, surface growth or other signs of failure. The absence of visible spoilage does not prove safety. This is not a canning method and not a controlled lactic fermentation.

Conditions

Temperature controlRefrigerated

Places

Russia

Historical attestation · Country evidence

Pechory District

Traditional preparation · Region evidence

Seto cultural area of Pechory

Documented preparation · Region evidence

Altai Republic

Traditional preparation · Region evidence

Finland

Traditional preparation · Country evidence

Lithuania

Traditional preparation · Country evidence

Ukrainian Carpathians

Traditional preparation · Region evidence

Kigoma–Uvinza

Documented preparation · Region evidence

Japan

Modern adaptation · Country evidence

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