Sweet and sour sauce is a popular sauce used in Chinese cuisine. It is commonly made with sugar and rice vinegar, with soy sauce, or tomatoes added for color. Unlike the near-universal soy sauce, sweet and sour sauce is not fermented; the ingredients are simly added together and mixed, usually over heat. Used in cooking, the sauce is often added to stir fried meats, such as pork, beef, shrimp, or chicken.