2. Wash the mutton, blanch it in boiling water, take it out and put it in a clean pot, add clean water, cook it with strong fire for about 10 minute, take it out and wash it with warm water, cut it into thin slices and spread it on the sheep skull;
3. Wrap Radix Rehmanniae Preparata, Rhizoma Dioscoreae, Cortex Moutan, Fructus Jujubae Peel, Alismatis Rhizoma, Radix Angelicae Sinensis, Carthami Flos, Rhizoma Gastrodiae, Polygoni Multiflori Radix, Semen Cuscutae, Folium Platycladi, Semen sojae atricolor, Semen Sesami Niger and Semen Juglandis in clean gauze, put them in a pot, add onion, ginger slices and white pepper, and add appropriate amount of water;
4. Put the pot on the fire, bring it to a boil with high fire, remove the floating foam, and simmer with low fire for about 1 half an hour. When the mutton is cooked and rotten, take out the sheep's head, sheep's bones and medicine bags, add shredded onion and ginger, refined salt and monosodium glutamate to taste, and drop sesame oil.