1. Prepare ingredients: pineapple, tenderloin, onion, pepper, green pepper, starch and tomato sauce.

2, onion, green pepper cut into pieces, pineapple washed and cut into pieces and soaked in salt water for 20 minutes.

3. Wash tenderloin, cut into pieces, add half an egg white, pepper, salt, cooking wine and appropriate amount of starch, grab it evenly, and marinate for 10 minute.

4. Fruit juice: 4 tablespoons of tomato sauce, 2 tablespoons of sugar, half a spoonful of salt, starch 1 tablespoon, soy sauce 1 tablespoon, half a bowl of water, and mixed into sweet and sour juice.

5. Pour the oil into the pot and heat it. Chopsticks can bubble when put down, and you can eat tenderloin. One by one, don't stick together, fry until the surface is slightly yellow and take it out.

6. Leave the bottom oil in the pot, add the onion and green pepper to stir fry until fragrant, add the prepared juice, stir fry until thick, add the fried meat and pineapple pieces, and stir well.