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Mentsuyu (noodle dipping sauce)

めんつゆ · tsuyu · mentsuyu · noodle soup base · つゆ · 麺つゆ

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Mentsuyu seasons Japanese noodles with dashi, soy sauce and mirin. Two home formulas are recorded here: a 2012 light-soy and bonito sauce, and a concentrate diluted 1:2 for dipping or 1:4 for hot soup.

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Clear amber mentsuyu noodle dipping sauce in a small glass bowl, with dried kombu and bonito flakes beside it.

One documented household formula

Mentsuyu is a seasoned dashi liquid used with Japanese noodles. The first recipe recorded here is a household version published in 2012 by Minna no Kyo no Ryori, taught by the late Japanese cooking teacher Nobuko Shimizu. It uses light soy sauce, mirin, kombu-and-bonito-flavoured dashi and an extra short steep of bonito flakes, then finishes with umezu or ordinary vinegar. It is presented as a versatile seasoning as well as a noodle dip.

The recipe yields approximately 550 mL and gives ten minutes as the cooking time. Its measuring cup is the site's 200 mL cup, so the two half-cup measures are recorded as 100 mL each and the two cups of dashi as 400 mL. These conversions follow the same publisher's measurement guidance. They document this formula; they are not general mentsuyu ratios.

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A concentrate to dilute

Just One Cookbook's mentsuyu is a different shape of the same idea: a concentrate rather than a ready sauce. Sake, mirin and soy sauce are heated with a piece of kombu and a cup of katsuobushi, simmered for five minutes, cooled and strained, giving about two cups. The site uses it for noodle dishes, rice bowls, hot pots and as a tempura dipping sauce.

It is diluted at the table. One part concentrate to two parts water makes a cold dipping sauce (tsuketsuyu) for zaru soba or tanuki udon; one to four makes a hot noodle soup (kaketsuyu) for udon or soba. The author says to adjust both to taste. The same page offers a vegetarian version without bonito, or with two dried shiitake. These ratios belong to this recipe; they are not a standard that applies to a bottle from the shop.

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A brief history with gaps

A 1997 Brewing Society of Japan article describes tsuyu as a liquid seasoning made from soy sauce and dashi and used for soba, udon and other dishes. It says soba-tsuyu is thought to have appeared when soba was being made into long noodles in the late sixteenth century, but presents that dating as tentative. The paper does not date every kind of tsuyu or the specific 2012 home formula.

A separate 1985 brewing-industry article says commercial mentsuyu started to be sold in Japan in the 1950s. It summarizes the 1984 Japanese Agricultural Standard definition as soy sauce with sugar and dashi extracted from flavour ingredients, with mirin, salt and other seasonings sometimes added. The commercial category therefore includes variation in ingredients and use; it is not a single historic recipe.

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Taste and regional variation

In Shimizu's formula, dashi and the extra bonito steep supply a savoury, fish-led base; mirin rounds it with sweetness, while light soy sauce seasons it without the recipe being identified as one regional style. The cook's introduction says the small addition of umezu or vinegar adds richness. The sauce is strained after the short steep, and the source gives no numeric temperature or concentration target.

The 1997 article characterizes Kanto soba tsuyu as darker and more strongly reliant on bonito, while describing Kansai versions as combining kombu with the stock. These are broad regional descriptions from a secondary industry article, not rules for every home or maker. Shimizu's recipe calls for usukuchi soy sauce and kombu-bonito dashi but gives no specific region; it should not be assigned to Kanto or Kansai on that basis.

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Noodles, dipping and dilution

The Ministry of Agriculture, Forestry and Fisheries describes tsuyu with Fukui's Echizen soba, both as a dipping sauce and poured over noodles in the regional oroshi-soba style. That documents one use in Japan; it does not make Echizen soba the origin of mentsuyu. Commercial products may be concentrates or ready to use, and the 1985 industry article records different product strengths. Follow the bottle's own dilution label; these recipes do not establish a ratio that applies to every product.

Mentsuyu has a lighter sibling, shiro dashi, which uses light soy sauce and no sake to keep soups and custards pale.

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Allergens and storage

These versions include bonito and a kombu-and-bonito dashi, so they contain fish. They also use soy sauce: check the actual product label for soy and wheat, since recipes and commercial sauces can differ and Japanese labelling guidance distinguishes between allergens requiring declaration and those recommended for declaration.

The NHK recipe page suggests keeping its batch refrigerated for about two weeks, and Just One Cookbook gives up to one month for its concentrate, in a mason jar. Those are the authors' recipe-page guidance, not validated shelf-life studies. General Food Standards Agency advice for leftovers is to cool and refrigerate cooked food within two hours, then eat within 48 hours or freeze. This conservative general advice is recorded here without claiming that it validates a specific mentsuyu shelf life.

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History

A 1997 Brewing Society of Japan article says soba-tsuyu is thought to have appeared when soba began to be made into long noodles in the late sixteenth century, explicitly presenting this as a tentative account. A separate 1985 article reports that commercial mentsuyu began appearing in the 1950s and describes the 1984 Japanese Agricultural Standard definition. These records do not establish a single origin or date for every tsuyu style.

Ingredients

Yield 550 mL · Scaling: source batch only

Mirin
100 mL
The source gives 1/2 of its 200 mL measuring cup.
Usukuchi soy sauce
100 mL
The source gives 1/2 of its 200 mL measuring cup.
Dashi (kombu and bonito)Use kombu-and-bonito dashi; the recipe site's guidance says its unspecified dashi uses both.
400 mL
The source gives 2 of its 200 mL measuring cups.
Bonito flakes
5 g
Added after the dashi as an extra bonito infusion.
Umezu
2.5 mL
1/2 Japanese teaspoon; the site defines 1 teaspoon as 5 mL. The source allows vinegar as an alternative.

Method

Risks and precautions · Standard risk
Fish allergen

The recipes include bonito flakes and kombu-and-bonito dashi.

Hazard source
Soy and possible wheat allergens

The recipes use soy sauce. Check its product label for soybean and wheat content.

Hazard source

Cool the cooked sauce and refrigerate within two hours; use within 48 hours or freeze, following general leftover guidance. This does not establish a mentsuyu-specific shelf life.

Control source

Contains bonito fish and soy; check the soy sauce and dashi labels for wheat and other declared allergens.

The NHK recipe page suggests about two weeks refrigerated and Just One Cookbook says up to one month for its concentrate. Both are the authors' own statements, not independently validated; this record uses general Food Standards Agency leftover guidance as the conservative reference.

  1. Pour the mirin into a saucepan and bring it to a boil over strong medium heat. This version uses the source's non-flaming alternative to its optional flambe step; boil it thoroughly to drive off alcohol.
  2. Add the usukuchi soy sauce, dashi and bonito flakes. Simmer over medium heat for 1-2 minutes to steep the flakes.
  3. Turn off the heat and stir in the umezu or vinegar. Strain through a large tea strainer and transfer to a clean bottle.
  4. Concentrate variation (Just One Cookbook): combine 1/2 cup sake, 1 1/8 cups mirin, 1 cup soy sauce, a 5 g piece of kombu (about 5 x 5 cm) and 1 packed cup of katsuobushi in a saucepan. Bring slowly to a boil over medium-low heat, reduce to low and simmer for 5 minutes, then turn off the heat and let it cool. Pass through a fine-mesh sieve. This yields about 2 cups of concentrate; for a vegetarian version omit the bonito or use 2 dried shiitake.
  5. Dilute the concentrate with water to use: 1 part mentsuyu to 2 parts water for a cold dipping sauce (zaru soba, tanuki udon) and 1 to 4 for hot noodle soup (udon, soba). Adjust to taste.

Conditions

Yield550 mL
Active time10 min

Places

Japan

Documented preparation · Country evidence

Japanese recipe and regional noodle-use sources document preparation and use in Japan; they do not establish a birthplace for the wider family of tsuyu sauces.

See Japanon the mapLocation source 1 → · Location source 2 →

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