1, skin belly soaking method: after washing the dry skin belly, soak it in warm water for about 1 to 3 days. During soaking, clean warm water should be used several times to prevent deterioration, until the skin belly can be easily penetrated with chopsticks, it is said that the skin belly has been soaked.

2. Soak the washed belly in hot water until soft, then boil it and turn to low heat for a while. You can wash your stomach with hot alkali, and the effect is better. But if you wash your stomach with hot alkali, you need to add some vinegar to neutralize the alkali taste when cooking.

3. Soak the dry belly in hot alkaline water for about half an hour, then rinse it with clear water (adding a little vinegar is more beneficial to remove the alkaline smell when washing), and then rinse it with clear water for 2 to 3 hours.