Yellow sauce is also called soybean sauce and bean sauce. It is made by frying soybeans and then fermenting them. It is a traditional seasoning sauce in China. The yellow sauce has a strong sauce and ester fragrance, and it is salty and sweet. It can be used to cook various dishes and is also one of the ingredients for making fried noodles . High-quality yellow sauce is mostly reddish brown or brown, bright and shiny, moderate viscosity, fresh and mellow, salty and sweet, no peculiar smell, no impurities.