Oyster sauce is a seasoning made from oysters.Oyster sauce is a traditional umami seasoning commonly used in Guangdong, and it is also one of the most authentic products in the sauce category.It uses oysters known as"undersea milk"as raw materials,and is cooked to extract the juice and concentrate, and then refined with auxiliary ingredients.Oyster sauce is delicious,rich in oyster aroma, moderately viscous,and high in nutritional value.