Oyster black bean, also known as "dried oyster", is a dried product of seafood and oyster (also known as oyster) meat. Mainly produced in Guangdong, it is a must-eat dish for Guangdong people during the Spring Festival. Oyster, alias Oyster Yellow and Oyster Seed, is a popular seafood food. Its meat is rich in nutrition, including protein 45-57%, fat 7-11%,glycogen19-38%, and a large amount of vitamins, etc., which is known as "sea milk". Oyster is a kind of shellfish, which is one of the main objects of shellfish culture. There are two ways to make oyster sauce: generally, fresh oyster meat and juice are cooked together, and then dried or dried to make "cooked oyster sauce".

It is actually dried oysters, which are mostly used for making soup and are also very good.