The purchased frozen jiaozi does not need to be thawed, so it can be taken out of the refrigerator and boiled in boiling water. If it is thawed first, the skin will be wet and it will easily stick to rags. Boil the water, put some salt and oil in the boiling water, and then put it in jiaozi. Stick chopsticks to the bottom of the pot and stir around, so that jiaozi won't get together. Cook for a while and then stir. Jiaozi stuck together during freezing will automatically separate, because there is oil in the water, which will not stick together again. If you stir with a spatula or spoon, it will easily hurt the dumpling skin, so stir with chopsticks. Salt can make flour tough, so put salt.