1. 15-20 minutes is enough. Use cold water to steam and freeze dumplings, and boiling water to steam freshly made dumplings. This is a common sense issue when eating dumplings in life. Do not use hot water to steam or freeze dumplings, because the water temperature is too high, and if the quick-frozen dumplings are suddenly exposed to heat, it is easy for the outer skin to be cooked and the inside to be still. Frozen dumplings that are raw and unevenly heated will not taste good after steaming, and the dumpling wrappers are prone to cracking.

2. At the same time, do not steam or freeze dumplings for too long. Over time, the water will evaporate and the dumplings will become dry and hard. If the time is short, they may not be cooked yet. Generally, steam them for 15-20 days depending on the quantity. Minutes are enough. After steaming, you can pick one with chopsticks and taste it to see if there is any uncooked hard core. If it is not cooked, continue steaming until it is cooked.