Don't open the lid of steamed buns in a hurry. When the temperature in the pot drops slightly after 2~3 minutes, open the lid quickly, so as not to let the steam on the lid drip on the buns. In addition, the exposed stuffing of steamed buns may have a certain relationship with the wrapping method. Whether the steamed buns are tightly closed or whether the stuffing contains soup will lead to the phenomenon of "collapse" or even "dead skin" after steaming (such as steaming with hot noodles).