Soy sauce and Tamari are used in many recipes as a flavorful addition to Asian dishes. It is important to note that these two ingredients are not interchangeable. Here's why. Mainly, soy sauce is a liquid condiment made from brine-cured soybeans, roasted wheat, barley, water, and salt. It's rich in flavor and protein and gluten-free! On the other hand, Tamari is a naturally brewed soy sauce that contains little to no wheat. Finally, you can substitute Tamari for soy sauce by simply using half as much of whichever you choose. Just keep in mind that they won't taste exactly alike!