1Cut beef into bite-sized cubes and marinate with Shaoxing wine, soy sauce, salt, cornstarch, and neutral oil.
2Chop bell peppers and onions into petals, and finely mince ginger and garlic.
3Combine sauce ingredients: beef stock, light and dark soy sauce, oyster sauce, ketchup, sugar, MSG, black pepper, Sichuan peppercorn powder, white pepper, and cornstarch.
4Heat 2 tbsp of oil in a hot wok and sear the beef for 3-4 minutes until a nice crust forms.
5Remove beef and add more oil to the wok. Sauté garlic, ginger, and vegetables until slightly translucent (about 2 minutes).
6Add the beef back to the wok and pour in the sauce. Once thickened, finish with sesame oil.