2. The pigskin is degreased and depilated, such as boiled for 5 minutes, fished out, washed away, and cut into mahjong tiles.

3. Put the pigskin into the pot and add soy sauce for coloring. After the soy sauce is tasted, pour in water (just don't pass the pigskin), and add the right amount of rock sugar and salt according to your own taste.

4. Cook on low heat for about 20 minutes, insert it easily with chopsticks, turn on the fire, and collect the juice to eat.