1. Wash the pigs' hands that you bought back.
2. Wash the soybeans.
3. Blanch the pork knuckles in water (about 5 minutes), remove the fishy smell, remove it, cut a knife in the middle, and set aside.
4. Put pork knuckles and soybeans in a pressure cooker, add ginger slices and star anise.
5. Fill half a pot of water, and it’s okay if the pork knuckle has not passed.
6. Put on the lid of the pressure cooker, and press for 20 minutes on medium heat.
7. After 20 minutes, exhaust the pressure cooker, open the lid, remove the pork knuckles, and cut into large pieces.
8. Put the pork knuckle and soybean soup into a bowl, sprinkle a little salt and coriander.
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