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Pitkäpiimä

Long milk · Pitkäpiimäinen piimä · Long viili

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Pitkäpiimä is a Finnish cultured milk whose defining trait is a long, stretchy, ropy texture. It is closely related to viili and is made by lactic fermentation with a specific culture.

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Photograph of Pitkäpiimä.

What the name says

Pitkäpiimä joins two Finnish words: pitkä, long, and piimä, the general Finnish word for cultured milk. The name describes the texture. When the milk is left unmixed, the curd forms a long, stretchy structure that can be drawn into threads from a spoon. Valio uses the word pitkäpiimäisiä, long-type, to describe the western texture of the piimä it sells today.

Pitkäpiimä is therefore a texture as much as a product. It sits in a family of Finnish and Scandinavian cultured milks, and it should not be confused with the short, breaking piimä of Savo and Karelia, which Valio records as lyhyttä piimää, short piimä.

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Viili and its relatives

Viili is a mesophilic fermented milk: the culture works at moderate temperatures, and the milk sets without heating or a dairy plant. Wikipedia describes it as found mainly in Finland and Sweden, similar to yoghurt or kefir but stretchy when left unmixed. Swedish relatives include filmjölk and långfil, which means long viili, and the same family includes filbunke and kermaviili, cream viili.

The Valio description places pitkäpiimä with the western long-textured tradition. The name and the texture both point to viili, but the sources do not establish that the two are the same product.

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Why it stays ropy

The texture comes from the culture. Wikipedia reports that the slime-forming Lactococcus lactis subsp. cremoris produces a phosphate-containing heteropolysaccharide called viilian, close to kefiran, and that this exopolysaccharide gives viili its consistency. The same article lists other lactic bacteria in traditional cultures, including Lactococcus lactis subsp. lactis, Leuconostoc mesenteroides and the diacetyl-producing biovar, and it names yeasts and a surface fungus, Geotrichum candidum, in some traditional cultures.

The lactic acid makes the milk tangy and sets the curd. The polysaccharide makes it long. Valio says that the natural lactic acid bacteria give viili its structure and taste. Keep those separate: the acid is the lactic change, and the stretch is the polysaccharide.

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Making it, and the modern dairy

Valio makes its viili from pasteurised, non-homogenised Finnish milk with natural lactic acid bacteria and no preservatives. The Wikipedia article reports that the modern product is fermented in a dairy plant under controlled conditions with laboratory-grown cultures, then sold fresh. The sources do not describe the traditional household method in detail, and do not give a setting temperature or time for pitkäpiimä.

A household ferment is therefore a different thing from the sold product. The culture, the milk and the way it is left all affect the texture, and no source here gives a rule that makes an improvised batch the same as a commercial one.

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Eating it

Viili is eaten straight from the container or flavoured. Valio suggests fresh berries and fruit, jams, cinnamon, cardamom, muesli, talkkuna, and nuts and seeds. Traditionally it was a summer food, eaten with talkkuna, cinnamon or sugar. The same products are sold in lactose-free forms by Valio, and the lactose-free version is a modern adaptation.

The sources give no separate dish for pitkäpiimä. Its use follows the viili family: a cold, spoonable dairy food with fruit, sugar or grain on top.

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Unknowns

The sources reviewed for this page do not give a historical date, an ethnographic study of the household tradition, a setting temperature or time, a shelf life, or a microbiological safety limit. Valio’s history dates its own viili from the 1960s and its flavoured products from the 1980s, and those are commercial dates.

The Nordic atlas that supplied this record marks pitkäpiimä as a lactic tradition related to viili and separates a deliberate culture from an improvised ferment. This page keeps that boundary: texture from the intended culture is part of the food, and unknown sliminess is not.

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History

Pitkäpiimä is a long-textured piimä associated with western Finland, and Valio says that the piimä sold in shops today is of that western, long-textured kind. The short, breaking form was made in Savo and Karelia.

Ingredients

Scaling: source batch only

Pasteurised, non-homogenised milkValio uses fresh Finnish milk, pasteurised and not homogenised, with no preservatives.
Amount not stated
No volume or ratio is given in the sources.
Lactic acid bacteria cultureNatural lactic acid bacteria. The sources name Lactococcus lactis subsp. cremoris as the ropy-texture strain in viili.
Amount not stated
The amount of starter is not given in the sources.

Method

Risks and precautions
Spoilage from an improvised ferment

Ropy or slimy texture is part of pitkäpiimä when made with the intended culture. Unknown sliminess in an improvised ferment is a different situation and is not a safe sign.

Hazard source

Texture alone does not establish safety.

  1. Use pasteurised, non-homogenised milk. Valio names pasteurised, non-homogenised milk as the base for viili, with no preservatives added.
  2. Add the lactic culture to the milk. The culture gives the structure and the tangy flavour. The sources give no temperature or incubation time.
  3. Leave the milk to set. Viili is stretchy when left unmixed, according to Wikipedia.
  4. Let the cream rise to the surface, which is part of the traditional form.
  5. Eat it fresh or keep it cool. The sources reviewed do not give a storage limit.

Conditions

Temperature controlAmbient, monitored

Places

Finland

Traditional preparation · Country evidence

Named in Finnish sources as a traditional long-textured cultured milk. The sources do not give a historical origin.

See Finlandon the mapLocation source 1 →

Related

Made from

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