1. Incomplete thawing: Before putting the frozen jiaozi into boiling water, it must be completely thawed, otherwise the surface will be thawed and the inside will remain frozen, which will lead to the undercooked jiaozi.
2. Cooking time is too short: It takes patience and time to cook in jiaozi. If the cooking time is too short, there will be undercooked places in jiaozi, resulting in undercooked conditions.
3. The water temperature is not high enough: when cooking jiaozi, the water temperature should be kept boiling, so as to ensure that jiaozi can be fully heated. If the water temperature is not high enough, it will also cause jiaozi to be uncooked.
4. Too much jiaozi: If there is too much jiaozi, it will affect the rise of water temperature, and it will also lead to undercooked conditions.
5. Improper heating method: Some people will heat the refrigerator to freeze the jiaozi by steaming, but this will easily lead to excessive drying of the surface of jiaozi, while the inside is still frozen, and the cooked jiaozi will be unpalatable.
In a word, for jiaozi frozen in the refrigerator, a reasonable thawing method, an appropriate amount of jiaozi, a correct cooking method and enough time are the keys to ensure that jiaozi can be cooked.