1. Kelp wash and foam hair
2. When buying pork knuckles, let the vendor sing and chop the big bones, wash them and cut them into small pieces when they come back.
3. Cut all into small pieces
4. In a pan under cold water, boil for 2 minutes to let the blood come out
5. Rinse away blood foam with running water
6. Cut kelp into small pieces
7. Put all into the pressure cooker, pour in the cooking wine, pepper and ginger slices
8. Add appropriate amount of water, put it in the pressure cooker, close the lid and start the soup button
9. Wait for the pressure cooker to skip the key and let the gas out.
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