1. Wash the bone, put it in a cold water pot, add cooking wine, cook for 8 minutes, and take it out.

2. Peel and cut the yam, slice the ginger, cut the shallot into chopped green onion, and cut the green onion into sections.

3. Put the bone, green onion, ginger and pepper into the pot, add appropriate amount of water to boil, stew for 2 hours on medium fire, then add yam, salt and pepper and cook for 20 minutes.

4. Take it out after stewing and sprinkle with chopped green onion.