materials: appropriate amount of pig's trotters, appropriate amount of soy sauce, appropriate amount of aged vinegar, appropriate amount of oyster sauce and appropriate amount of white vinegar.

1. First, clean the pig's trotters, especially the dirt in the toes. Cut half in the middle with a knife.

2. add water to the pot to boil, and add a little white vinegar to make the trotters taste crisp and cool, then blanch them.

3. After boiling for 5 minutes, skim off the floating foam, remove the pig's trotters and put them in the basin.

4. While it is hot, add more light soy sauce, appropriate amount of oyster sauce and mature vinegar into pig's trotters, stir well and marinate for about 5 minutes.

5. add water to the pot, add light soy sauce, aged vinegar and oyster sauce, and bring to a boil over high fire. add the pot cover to the trotters and cook for 1 hour. after turning off the fire, soak them for half an hour to make them fully tasty.