1. Chicken breast cut into small pieces
2. Add one spoon of cooking wine and one spoon of light soy sauce and marinate for ten minutes
3. Add appropriate amount of flour and stir with chopsticks to make the chicken evenly stick to the flour
4. Heat the pot, add a proper amount of vegetable oil, the oil is 70% to 80% hot, and add the chicken
5. Fry until golden, remove it, and re-fry for another minute
6. Take out the oil control and reserve
7. Pour out all the oil in the pot, add four spoons of tomato sauce, four spoons of sugar, two spoons of vinegar, four spoons of water, and boil until bubbles rise
8. Pour in the chicken and stir fry evenly, so that the chicken is covered with tomato sauce and the heat can be turned off
9. The finished product, sweet and sour
