Step 1: Coat the beef by adding in cooking wine, sauce, salt, MSG (or chicken bouillon), egg white and meat tenderizer. Stir well it with chopsticks until you feel it is a bit sticky.

  Step 2: Place a wok over high heat until hot. Add some cooking oil, and add in the processed beef fillet slices to be fried for about 2 minutes. Turn off the fire and remove them when they look yellowish-white and put them in a dish.

  Step 3: Leave some cooking oil in the wok, swirling to coat the sides. Add in half of the mashed green onion, oyster sauce and tomato ketchup. Stir-fry over high heat for about 30 seconds. Then, add in the fried beef fillet slices and stir-fry for 1 minute. And in some soy sauce and black pepper to be stir-fried for about 20 seconds. Pick out them when the beef fillet slices turn dark brown.

  Step 4: Turn on the heat. Add some cooking oil again. Add in the left mashed green onion, ginger and garlic when the oil is hot. Stir-fry it for about 20 seconds until fragrant. Add in green pepper strips and onion pieces to be stir-fried for 1 minute. Add in some salt and MSG (or chicken essence). Stir-fry for 10 seconds again. Add in the stir-fried beef and stir it together with the others for 2-3 minutes.

  Step 5: Turn off the heat. Remove them from the wok and put them in a fine porcelain plate. Black pepper beef is ready, with an attractive color of brown, white and green.