2. Wash the pig's trotters and put them into the pot, add appropriate amount of water, onion and ginger, boil them over high fire, and then cook them over low heat until they are crisp and rotten (you can cook them less if you like chewing).

3. Dehydrate the cooked trotters, put them in a large bowl, add two spoonfuls of fermented milk, and marinate for 15 minutes.

4. Then pour out the excess rotten milk, sprinkle with bread crumbs and shake it a few times to make the pig's feet stained with bread crumbs.

5. Add oil to the pot, heat it to 80%, and add pig's trotters. Fry until light yellow and golden brown.

6. Put the oil juice in a colander and sprinkle with salt and pepper.