Prepare an old hen, 7 to 8 pieces of scallops, a piece of ham, a piece of ginger, a handful of shallots, a little yellow wine, a little salt and a little medlar. Put scallops in a cage, add yellow wine to remove fishy smell, steam for 20 minutes and take them out for later use. Take a ham with a bone, pat the ginger and tie the onion. Blanch the old hen with cold water and wash it clean. Cut off the head and tip of the chicken. Put the whole chicken in cold water, bring it to a boil with high fire, carefully skim off the floating foam, add minced onion and ginger, add ham, add steamed scallops, turn the heat down, cover the pot and stew for two hours. Time is up, add some salt to taste, take out the old hen and cook the soup in the casserole.