Place the ribs in starch and chicken powder and marinate for 10 minutes.
Marinate the ribs and cut the pineapple.
Boil the ribs and fry until it is cooked and picked up. Stir the tomato sauce with a small amount of oil, add sugar, stir fry for about 1 minute, add ribs and pineapple, stir until fully cooked, and serve.
With the addition of ketchup, there is no need to add vinegar, and the acidity is enough.