Marinate the thinly sliced beef sirloin with light soy sauce, Shaoxing wine, sesame oil, white pepper, and cornstarch for at least 15 minutes.
Prepare the sauce by combining light soy sauce, oyster sauce, sugar, water or beef broth, and cornstarch in a small bowl. Stir well.
Heat vegetable oil in a wok over high heat. Add the marinated beef and stir-fry quickly until it is about 80% cooked, about 1-2 minutes. Remove the beef from the wok and set aside.
In the same wok, add minced garlic and bell pepper chunks. Stir-fry for 1-2 minutes until the bell peppers are slightly tender-crisp.
Add the pineapple chunks and sliced pickled ginger to the wok. Stir-fry for 1 minute.
Return the partially cooked beef to the wok. Pour in the prepared sauce.
Stir-fry continuously for 1-2 minutes until the sauce thickens and coats the beef and vegetables evenly.
Serve immediately with steamed rice.
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