2. Scrape the pig's trotters clean, chop each pig's trotters into 4 pieces, blanch them in a boiling water pot, pick them up and wash them again with clean water.

3. Knot the onion and cut the ginger into pieces.

4. Pick out the impurities in the soybeans, soak them in cold water, and then pour them into the casserole.

5. Add water 1 0,000 ml to the casserole, cover the casserole, cook for about 2 hours with low fire, add pig's trotters to boil, skim the floating foam, add ginger slices, onion (knot) and yellow wine, stew with low fire until the soybeans and pig's trotters are crisp and rotten, add refined salt and high fire for about 5 minutes, and take out the onion knot and ginger slices.