Method
Marinate liver with soy sauce, Shaoxing wine, cornstarch, and a pinch of salt for 15–30 minutes.
Heat oil in a wok, stir-fry garlic, ginger, and onion until fragrant.
Add liver; stir-fry 2–3 minutes until just cooked.
Toss in bell pepper and scallions; add oyster sauce, sesame oil, and pepper. Stir well.
Serve immediately.