1. When making frozen ravioli, you should not use fierce fire. Unlike fresh wontons, it is not easy to break the skin when cooked with fierce fire. Frozen wontons are suitable for slow cooking over low heat so that the skin of the wontons will not be easily broken.

2. When making frozen wontons, add some salt to the water to make the skin more resistant to cooking. This way the skin of the wontons won't break easily.

3. When the salted water boils completely, put the frozen wontons in. Don't put them in too early or they will stick together easily, and stir them thoroughly after putting them in so that the skin won't be broken because of sticking together.

4. After the wontons are put in and the water boils again, pour in a small amount of cold water. This process is best repeated three times. Stir after pouring in the cold water so that the wontons don't break the skin.

5. If you are still afraid of wontons broken, cook with salt and then add some vinegar, so that wontons will not break the skin.