150g per pack. Kikkoman Corporation is a Japanese food manufacturer. Its main products and services include soy sauce, food seasoning and flavoring, mirin, shōchū, and sake, juice and other beverages, pharmaceuticals, and restaurant management services. Oyster sauce is, as advertised, made from oysters. It's a mixture of caramelized oyster juices (a byproduct of cooking oysters in water for a prolonged period of time), salt, sugar, and sometimes soy sauce that is thickened with cornstarch