1. Mince beef with sauce.
2. Wash and dice tomatoes.
3. Add water to the saucepan and cook the tomatoes together.
4. Add the tomato sauce after the water is hot.
5. Add light soy sauce and vinegar.
6. After boiling, add water starch and stir well.
7. After boiling again, add minced beef in soy sauce and stir well.
8. After turning off the heat, add pepper to taste.
9. Finished picture.
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