2. If the temperature in the refrigerator is very low and the dumplings are hard, it is recommended to thaw them and then cook them in boiling water. After the water boils, you need to add some cold water, then boil it for a while, and repeat it twice until the dumplings are all floating, so that the dumplings can be fully mature. Tangyuan is not suitable for boiling in cold water, and it is easy to break the skin.