Marinate beef cubes with light soy sauce, Shaoxing wine, baking soda (optional), cornstarch, sesame oil, and white pepper for at least 15-20 minutes.
Prepare the black pepper sauce by mixing all ingredients (oyster sauce, light soy sauce, dark soy sauce, sugar, ground black pepper, water/beef broth, cornstarch, sesame oil) in a small bowl.
Heat cooking oil in a wok over high heat until smoking. Add the marinated beef cubes and stir-fry quickly for 1-2 minutes until browned on the outside but still pink inside. Remove beef from wok and set aside.
In the same wok, add a little more oil if needed. Add minced garlic and ginger, stir-fry until fragrant (about 15 seconds).
Add onion, green bell pepper, and red bell pepper. Stir-fry for 2-3 minutes until vegetables are slightly tender but still crisp.
Return the beef to the wok. Pour in the black pepper sauce. Toss everything together quickly to coat the beef and vegetables evenly with the sauce. Cook for another 1-2 minutes until the sauce thickens.
Serve immediately with steamed rice.
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