1. Prepare all the ingredients you need.
2. Cut the sirloin into two-centimeter cubes, add an appropriate amount of black pepper, starch, and cooking wine to marinate for a while. Cut pineapple into pieces, and cut green and red peppers into pieces.
3. Pour oil into the pot and heat it to 50% hot. Coat the marinated meat with a layer of dry flour.
4. After the oil is hot, put the meat in a frying pan and fry it before taking it out. Turn the heat to a high level. When the oil heats up again, re-fry the meat again until it becomes golden brown and remove it.
5. Take half a bowl of water, add 2 tablespoons of tomato sauce, 4 tablespoons of sugar, appropriate amount of salt, and mix thoroughly. Take another bowl and blend an appropriate amount of water starch.
6. Pour a thin layer of oil into the pot, just a little bit.
7. Add pieces of green and red pepper, stir-fry for a while, serve out and set aside.
8. Boil the prepared sauce into the pot.
9. Pour in the fried meat pieces and the fried green and red pepper pieces, and stir-fry them quickly until the meat pieces are evenly coated with the sauce.
10. Pour in the pineapple chunks, stir fry a few times, and it will be ready to cook.
11. Pour in the pineapple chunks, stir fry a few times, and it will be ready to cook.
12. Serve for serving.
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