Three puts: put oyster sauce, put cooking oil, put shrimp. Oyster sauce can increase the fresh flavor of the filling, cooking oil can make the filling more lubricated, shrimp can provide nutrition and taste. Three do not put: do not put thirteen spices, do not put ginger, do not put green onion. Thirteen spices will steal the aroma of the chives, and ginger and scallions will affect the light flavor of the dumplings.