Creating Sizzling Chinese Pepper Steak with Onions can be straightforward if you follow these simple steps:

1. Marinate the Beef: In a bowl, combine the sliced flank steak, soy sauce, and cornstarch. Mix well and let it marinate for about 10 minutes.
2. Heat the Oil: In a large skillet or wok, heat 1 tablespoon of vegetable oil over medium-high heat.
3. Cook the Beef: Add the marinated beef to the hot skillet in a single layer. Stir-fry for about 3–4 minutes until browned and cooked through. Remove the beef from the skillet and set aside.
4. Sauté the Aromatics: In the same skillet, add the remaining tablespoon of oil. Add sliced onion, bell pepper, garlic, and ginger. Stir-fry for about 2–3 minutes until the vegetables are slightly softened.
5. Combine Ingredients: Return the cooked beef to the skillet. Add the Chinese cooking wine, oyster sauce, and black pepper. Stir well to combine all ingredients.
6. Sizzle it Up: Let mixture cook for another 1–2 minutes, allowing the sauce to thicken slightly and the flavors to meld together.
7. Finalize with Sesame Oil: Drizzle the sesame oil over the dish and give it a final stir.
8. Garnish: Remove from heat and garnish with chopped green onions and sesame seeds if desired.

These steps will guide you in creating this incredible dish effortlessly!