Method 1:
When cooking jiaozi, put more water in the pot, and at the same time, add some salt to increase the hardness of the dumpling skin. When the water boils, put jiaozi into the pot and stir with a spoon to prevent jiaozi from sticking to the pot. When the water keeps boiling, the jiaozi is easy to crack. You can add a little cold water after the water boils. When jiaozi floats on the water, it proves that jiaozi is ripe, so you can take it out, but don't overcook it. When cooking quick-frozen jiaozi jelly, use low fire to cook it, and it will take a little longer to avoid boiling.
Method 2:
First, take out a proper amount of jiaozi and soak it in cold water for about three minutes, making sure that the water does not pass through jiaozi. The purpose of this step is to make the dumpling skin absorb enough water, but not for too long. Then take the pot and fire, and put enough water to estimate that it can not cross jiaozi, so that jiaozi can be heated evenly. Boil the water with a big fire, and it can be put into jiaozi at this time. Turn down the fire a little. Don't rush to turn over the jiaozi after it is put into the water. Wait a minute or so and then stir it with a shovel to avoid sticking to the pot. Next, as soon as they float up one by one and become crystal clear, they can be fished out with a colander.
The above is the concrete solution of how to cook frozen jiaozi without breaking the skin. I believe everyone can learn it soon.