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Ingredient

Soy sauce

간장

Romanization: ganjang

Korean soy sauce, in two main kitchen forms: pale, salty guk-ganjang (soup soy sauce) brewed the traditional way from meju, and darker, sweeter jin-ganjang for braises and marinades.

Flavor

Guk-ganjang is sharply salty with a deep, savory, slightly funky aroma; jin-ganjang and brewed soy sauces are darker, rounder and slightly sweet.

Soy saucePhoto: Tim Reckmann from Hamm, Deutschland, CC BY 2.0, via Wikimedia Commons

Origin & History

Traditional ganjang is a by-product of the same process that makes doenjang. Soybean meju blocks made in autumn are dried in the spring sun, then steeped in brine of roughly 18–20% salt in sunny onggi jars for about 30–40 days. The liquid is ladled off, strained and boiled; the solids become doenjang. Many families keep a little old sauce as ssi-ganjang (seed soy sauce) to blend into each new batch, and UNESCO notes that some households age soy sauce for decades.

Soy sauce appears in the Samguk sagi among Silla's royal betrothal gifts of 683, and Goryeo records list jang among relief foods distributed to the hungry from 1018. Joseon cookbooks give many methods, and the Encyclopedia of Korean Culture describes how households grade sauce by age: young, thin sauce for soups, medium sauce for stews and namul, and jin-ganjang aged five years or more — dark and sweetish — for special dishes. In 2024 UNESCO inscribed Korean jang-making, including soy sauce, on its Representative List of the Intangible Cultural Heritage of Humanity.

Today the names mean something slightly different. Guk-ganjang (also joseon-ganjang or, on labels, hansik-ganjang) is the traditional meju-and-brine sauce: light in color, very salty and used to season clear soups and namul without darkening them. Supermarket jin-ganjang is a factory sauce for braises, stir-fries and marinades; Korean labeling separates brewed (yangjo), acid-hydrolyzed (sanbunhae) and blended (honhap) soy sauces, and many products sold as jin-ganjang are blends. Brewed soy sauce is made from soybeans or defatted soybeans mixed with wheat and fermented for months, while acid-hydrolyzed sauce is produced chemically in a few days.

Nutrition

per 100 g (Korean Food Composition Table: 간장, 재래 — traditional Korean soy sauce, i.e. guk-ganjang type)
Calories34 kcal
Protein5.9 g
Fat0 g
Carbohydrates2.5 g
Fiber0.4 g
Sodium7999 mg

Values from the Korean Food Composition Table (RDA, 2020 data). For comparison, the same table lists brewed soy sauce (간장, 개량, 양조) at 103 kcal and 4,783 mg sodium per 100 g, and acid-hydrolyzed soy sauce at 5,476 mg sodium. Actual values vary with ingredients, portion size and preparation.

Health Benefits

  • A seasoning, not a nutrient source: Soy sauce is used by the teaspoon to add salt and savory depth; it contributes little else nutritionally.
  • Very high in sodium: Traditional soup soy sauce contains about 8 g of sodium per 100 g in Korean food-composition data. The FDA's daily value for sodium is less than 2,300 mg, and diets high in sodium are linked to high blood pressure.
  • Lighter hand, same flavor: Because guk-ganjang is saltier than jin-ganjang, recipes call for less of it; swapping one for the other one-to-one changes both salt and color.
  • Allergens: All soy sauces contain soy; brewed and blended types usually contain wheat as well.

Informational, not medical advice. Talk to a qualified professional about your own health and diet.

Dishes with Soy sauce