Yam and shiitake mushrooms can be stewed in duck soup. Shiitake mushrooms are rich in nutrients, especially amino acids and trace elements, such as manganese, zinc, copper, magnesium, selenium and other trace elements. Yams can nourish the kidneys and essence, and tonify the three yin levels. Duck meat is mild in nature and can nourish yin and blood. It can also nourish qi and blood. It can have a very good nourishing effect for patients with physical weakness