1. Boil the tailbone in water to remove the foam, put it in the pressure cooker and add water at one time.
2. Soak dried shiitake mushrooms in advance to make yam peeled and cut into sections.
3. Boil on high heat for 10 minutes, then turn to low heat and simmer.
4. Pour the shiitake mushrooms and yam in a boiling pan.
5. Do not cover the pot tightly to continue cooking.
6. The yam mushrooms are cooked and seasoned with salt.
7. Add pepper at the end.
8. Out of the pot.
9. Began to eat.
10. Began to eat.
Tips:Don't peel the yam in hot weather in advance. Sometimes the yam will turn black as soon as it is peeled. Soaking it with white vinegar and salt is useless.
