
Slice the beef thinly across the grain and place it in a large bowl. Add the rice wine, Chinese black vinegar, white pepper, cinnamon, ground ginger, and minced garlic, then toss until the beef is evenly coated.



Sprinkle in the cornstarch and mix well so every slice of beef has a light coating. Cover and marinate for 1 hour to help the beef become flavorful and tender.



Heat the oil in a large wok or heavy skillet over high heat until shimmering. Add the marinated beef and onion, then stir-fry quickly until the beef is browned on the outside.


Add the broccoli and continue stir-frying until the florets are bright green and crisp-tender. Stir in the oyster sauce and cook briefly until everything is glossy and well coated.
Finish with a drizzle of sesame oil, toss once more, and serve hot with steamed rice or noodles.




