Oyster sauce is commonly used in stir-fries like our Beef Stir-Fry with Bell Peppers and Black Pepper Sauce. It is also a key ingredient in Kung Pao Shrimp, Spicy Sichuan Noodles, and other Asian-style dishes. The bottled sauce, also known as oyster-flavored sauce, is made from a reduction of boiled oysters. Savory with a hint of sweetness, it is a rich, concentrated mixture of the oyster extractives, brine, and assorted seasonings. In our tasting, testers described the winner as slightly fishy with caramel undertones and good depth of flavor.