1Season the 1 pound of beef flank with half a tablespoon of dark soy sauce, 1 tablespoon of white cooking wine, half a tablespoon of soy sauce, 1/4 teaspoon of baking soda, 1/4 teaspoon of white pepper, and 3 tablespoons of cornstarch.
2Mix until well combined and let it marinate for 15 minutes.
3For the sauce, combine 1 tablespoon of oyster sauce, half a tablespoon of dark soy sauce, half a tablespoon of soy sauce, 1 teaspoon of chicken bouillon, 2 teaspoons of sugar, half a teaspoon of white pepper, and 1 teaspoon of sesame oil.
4Set a hybrid wok to medium heat and add 1/3 cup of oil.
5Add the marinated meat to the hot oil, spread evenly, and cook for about 3 minutes per side (total 6 minutes).
6Remove the cooked meat from the wok.
7In the same oil, sauté 5 minced garlic cloves and 1 teaspoon of grated ginger for about a minute.
8Add 1 white onion and sauté for about 2 minutes or until slightly translucent.
9Add the beef back into the wok.
10Pour in the prepared sauce and sauté for about 2 more minutes.
11Add some green onion and toss to combine.
12Serve the Mongolian beef over a bed of white rice and enjoy.