Exercise:

Dice beef tenderloin and add two spoonfuls of soy sauce.

A spoonful of soy sauce, a spoonful of cooking oil.

Grab half a spoonful of black pepper and one spoonful of starch for pickling 15 minutes.

Grab it and marinate it. Cut the pineapple and soak it in salt water for ten minutes.

Stir-fry beef in oil until smooth, add pineapple and stir-fry until soft, then season with salt and black pepper.