Use water starch, salt, monosodium glutamate, cooking wine (if you like spicy food, you can also add some Chili oil), then mix well with the meat and leave it for a while. Stir-fry with high fire. The meat fried in this way is tender. PS: At home, I think that's how my mother cooked the food. What I remember most is the shredded beef with pickled peppers made by my mother. It's really tender and smooth, and my mouth is watering ~ ~ ~