Generally, oysters need to be cleaned before eating. There is a part of black substance on oysters, which is the internal organs of oysters. Internal organs contain metabolites and sediments of oysters, which are inedible.

Oyster contains 45%~52% protein, 7%~ 1 1% fat and 0/9% ~ 38% total sugar/kloc-0. In addition, they are rich in vitamins A, B 1, B2, D and G, and their iodine content is 200 times higher than that of milk or egg yolk. After concentration, it is called "oyster sauce"; Meat can be eaten fresh or made into dry products, that is, the traditional famous "oyster sauce".