1, astragalus. Stewed astragalus with old duck has the highest nutritional value. If people are short of qi and blood, adding a little astragalus into stewed old duck soup can play a conditioning role, taste good, and can also remove the fishy smell of astragalus.

2, sour radish. Stewing old duck with pickled radish is the best way to make sour radish old duck soup. But also can get rid of the feeling of autumn dryness. In the collocation of this dish, there are still requirements for the purchase of ducks, preferably old ducks, because ducklings can't stand stewing and it is not easy to reflect the taste of sour radish. It also has the effect of relieving summer heat.

3. potatoes. Duck and potatoes are as delicious as the above two. But potatoes are not stewed, and they are usually added when cooking soup. Potatoes have many nutritional functions, and the content of protein is also high. Cooking these two ingredients together is perfect.