Oyster sauce is a traditional fresh seasoning commonly used in Guangdong and one of the largest products in the sauce category. It is made from oysters, boiled and concentrated in juice, and refined by adding auxiliary ingredients. Oyster sauce is delicious, rich in oyster flavor, thick and moderate in consistency and high in nutritional value, and is also the main ingredient in the preparation of traditional Cantonese dishes such as beef with mushrooms in oyster sauce, green vegetables in oyster sauce and noodles in oyster sauce. Oyster sauce is also very convenient to use and has a wide range of seasoning, and can be used to season all salty foods.