Soy sauce is a salty liquid made from fermented soy beans, roasted wheat, water and salt. Packed with umami, soy sauce is used as a condiment and seasoning in Asian cuisines.

Soy sauce comes in many subtle variations, but is generally broken down into dark and light varieties. Light soy sauce is generally saltier and thinner than dark soy and does not stain food while cooking. Chinese black soy has added molasses that colors dishes as it cooks. The whole soy beans used to make quality soy sauce lend it a dark color, but cheaper brands using soy protein may cheat by adding caramel coloring.

The Japanese use soy sauce as a dipping sauce for sashimi or to season tofu, grilled meat and vegetable dishes. The Chinese use soy sauce mainly for marinades. In Indonesia, it is used mostly as a table condiment (called kecap, which comes in sweet and salty variations).

Be warned: though Japanese tamari (a slightly thicker and complex soy sauce made from more soybeans than most) is generally wheat-free, other commercial brands of soy sauce do contain gluten, so if you are trying to cook gluten-free, check the labels carefully.