Soy sauce is brewed from soybeans, roasted wheat, salt and a koji mold culture, then aged for months. The styles are not interchangeable. Chinese light soy sauce (生抽) is thin, salty and the everyday seasoning for stir-fries and dipping. Chinese dark soy sauce (老抽) is aged longer with molasses; it is less salty, slightly sweet and used in small amounts for color in braises and fried rice. Japanese shoyu (Kikkoman-style koikuchi) uses more wheat, so it is rounder and a little sweeter, ideal for teriyaki, ramen and sushi. Korean guk-ganjang (soup soy sauce) is pale, very salty and reserved for soups and namul. Tamari is brewed with little or no wheat: darker, thicker, mellower and usually gluten-free.

How to buy

Check the label for "naturally brewed" or "fermented" and a short ingredient list (water, soybeans, wheat, salt); skip anything made from hydrolyzed vegetable protein. For Chinese recipes buy Pearl River Bridge or Lee Kum Kee light and dark; for Japanese, Kikkoman or Yamasa; for Korean, Sempio soup soy sauce; San-J tamari for gluten-free. Kikkoman is in every US supermarket, the rest at H Mart, 99 Ranch or Amazon.

How to store

Unopened soy sauce keeps for two to three years in the pantry. After opening, refrigerate it; the flavor stays bright for about six months, though it is safe far longer. At room temperature it slowly darkens and tastes flat and harsh. A white film or sour, yeasty smell means it is time to replace the bottle.

Substitutes

  • Tamari for regular soy sauce, 1:1 – nearly identical, slightly richer; the standard gluten-free swap.
  • Japanese shoyu for Chinese light soy, 1:1 – works everywhere, marginally sweeter; add a pinch of salt.
  • Light soy plus a little molasses or dark brown sugar for dark soy – 1 tbsp light + 1/2 tsp molasses gives the color, not the depth.
  • Coconut aminos, 1:1 then taste – soy-free and sweeter with about half the salt, so season up.

How to use

Use light soy or shoyu to season and dark soy only to color: a teaspoon of dark turns a whole wok of fried rice mahogany, while a tablespoon makes it bitter. Add soy sauce at the end of a stir-fry or splash it around the hot edge of the wok so it caramelizes rather than steaming the vegetables. When a recipe just says "soy sauce" it means light or all-purpose, never dark, and never Korean soup soy sauce, which is roughly twice as salty.

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