1. Wash and blanch the trotters.
2. Put cooking wine, star anise, ginger, onion, proper amount of salt, pig's trotters and water in the pressure cooker, and turn off the fire after spraying hot air.
3. When the hot air dissipates completely, take out the pig's trotters, remove the bones and other sundries, pour the bones and the soup in the pressure cooker into another cooking pot, pour more water, sprinkle a little soy sauce to adjust the color and then sprinkle some salt, and cook until the soup is half empty, showing a thick milky white. Turn off the heating.
4. Take out the bones, add the pig's trotters and pigskin, and continue to cook until the soup is almost 1.5 times that of the pig's trotters. Turn off the fire, cool it and put it in the refrigerator for at least 12 hours.
5. Take out the slice. If you feel that the hoof is not frozen enough, you can add the same amount of water to cook it again and then refrigerate it.
6, pig's trotters can be directly sliced to eat, according to personal taste, mixed with food, or directly poured on pig's trotters.