Marinate beef slices with light soy sauce, oyster sauce, cornstarch, water, and white pepper for 10 minutes.
Heat cooking oil in a wok over high heat. Add marinated beef and stir-fry quickly until about 80% cooked, about 1-2 minutes. Remove beef from wok and set aside.
In the same wok, add minced garlic and julienned ginger. Stir-fry until fragrant. Add sliced pickled mustard greens and stir-fry for 2-3 minutes.
Return the beef to the wok. Add sugar. If using, deglaze with Shaoxing wine. Stir-fry everything together for another 1-2 minutes until heated through and well combined.
Serve hot with steamed rice or noodles.
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