Hello, professional chef jake will answer your questions. Tomato sauce is mainly used for sweet and sour taste. The sweet and sour taste is composed of the following seasonings (different regions, different factions and different seasonings), which are mixed with salt, sugar, vinegar (white vinegar), tomato sauce and red oil (Chili oil). After the answer, welcome to communicate. You can ask me directly if you don't understand cooking in the future.