Practice (1) Wash the old duck, remove hair, viscera, drain water, and put it in the oil pan for a little frying.
(2) removing the pedicels of Pleurotus ostreatus, soaking it with dried tangerine peel and Phyllostachys edulis in clear water respectively, and washing it.
(3) Wash ham bones and lean pork with clear water respectively, and drain the water.
(4) Add a proper amount of clear water into the earthenware pot, simmer with strong fire until the water boils, then add the old duck, dried tangerine peel, dried ginger column, ham bone and lean pork, wait for the water to boil again, continue to simmer for about 2 hours with medium fire, then add the mushroom, season with a little salt, and serve with meals.