Recipe: 1.Marinade the beef with 1/4 teaspoon of salt, 1/2 teaspoon of chicken stock, 1 tablespoon oil, 1 teaspoon cooking wine,2 teaspoon of egg white, a few of sesame oil, 1 teaspoon of meat tenderizer, keep in the bowl for 5-10 minutes. 2.Heat the wok with 3 tablespoon oil, fry the ginger, garlic first, then put the green pepper, red bell pepper and mushroom in, stir quickly and add a little water. 3.Quickly stir fried the beef, add 1 tablespoon oyster sauce, half tablespoon soy sauce, 1/2 teaspoon salt, 1/2teaspoon chicken stock, then corn starch water to thick the sauce. 4.Add spring onion and then add sesame oil, white pepper, ready to serve. For more information about Chinese food, please click:https://www.chinahighlights.com/travelguide/chinese-food/cooking.htm