Function：

Instructions：

1. Soak the selected slice of ganoderma lucidums(black) in water for a while, rinse the natural ophiopogon thoroughly for later use;
2. Soak the dried mandarin peel (aged) in water, remove its vein; remove the kernel of the jujubes(XL) and rinse thoroughly;
3. Remove the skin and cut the old duck in pieces, blanch the pieces in water with ginger and spring onion, take them out and rinse thoroughly for later use;
4. Put all ingredients into a steaming pot, pour in some hot water, stew over water for about 2 hours, add salt before serving.