1. Add the beef bones to the water, blanch it, clean it and add it to the casserole
2. Add ginger slices
3. Add scallion white
4. Then turn to medium and low heat and simmer slowly
5. Clean and cut tomatoes
6. Add to the casserole
7. Stir well
8. Add salt
9. Simmer for an hour and add yam
10. Then stew
11. Stew until tasty
12. Then install
Tips:Beef bones must be blanched in hot water and simmered slowly over low heat
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