Soy Sauce Soy sauce is a liquid made from soybeans, wheat, water and salt . They are... Naturally brewed is fermented for months or longer. Best soy sauce is two years or older. Fermented, and Chemically produced or Non-brewed is produced in days and it is super salty... needless to explain further... I will skip this type of soy sauce. See LA Choy 東 brand as an example Japanese Shoyu vs Chinese Soy Sauce Shoyu is brewed with roasted wheat and Chinese soy sauce, which traditionally left out the wheat, is nowadays brewed with wheat flour. In addition, Chinese sauce sometimes contains added sugar. With difference ingredients, Shoyu is slightly sweeter, rounder flavor and Chinese soy sauce a denser, saltier finish and darker in color. Tamari is a Japanese soy sauce brewed with soybeans and no wheat—but sometimes there is a trace amount. So, not all tamari is gluten free. Check the label to make sure. Know the ingredients Look for "brewed" or...