Marinate the beef slices with light soy sauce, Shaoxing wine, sugar, cornstarch, and cooking oil for at least 15 minutes.
Prepare the sauce: In a small bowl, combine light soy sauce, oyster sauce, sugar, water, and cornstarch. Mix well.
Heat cooking oil in a wok over high heat until smoking. Add the marinated beef and stir-fry quickly for 1-2 minutes until browned but still tender. Remove beef from wok and set aside.
In the same wok, add a little more oil if needed. Stir-fry pickled ginger, pineapple chunks, and bell peppers (if using) for 2-3 minutes until pineapple is slightly caramelized and bell peppers are tender-crisp.
Return the beef to the wok. Pour in the prepared sauce mixture. Stir-fry for another 1-2 minutes until the sauce thickens and coats all ingredients.
Serve immediately with hot white rice.
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