1. Ingredients: 500g of an old duck, 2 yams, 1 lotus seed, 1 barley, 1 box of dendrobium, green onions, ginger, and appropriate amount of salt.

2. First put the dendrobium, barley and longan into a casserole and simmer for about 20 minutes, then process the duck.

3. Then prepare an old duck, cut it into large pieces and blanch it to remove the blood. Then prepare the yam, peel it and wash it, and then add the lotus seeds.

4. Put the old duck and yam into the soup together, then add ginger and green onions. Add an appropriate amount of cooking wine and simmer the soup together. After 1 hour, add the lotus seeds and simmer for about 40 minutes. Then add salt to taste and turn off the heat.