Instructions
Step 1: Marinate the Beef
In a bowl, mix the sliced beef with cornstarch and 1 teaspoon of soy sauce. Set aside to marinate while preparing other ingredients.

Step 2: Make the Sauce
In a small bowl, combine the remaining soy sauce, oyster sauce, hoisin sauce, sugar, and freshly cracked black pepper. Stir well and set aside.

Step 3: Cook the Beef
Heat vegetable oil in a wok or large skillet over high heat. Add minced garlic and sauté for a few seconds until fragrant.
Add the marinated beef and stir-fry until browned and nearly cooked through.

Step 4: Add the Vegetables
Add the sliced onion and green onions. Stir-fry for 2–3 minutes until the vegetables are slightly tender but still crisp.

Step 5: Add the Sauce
Pour in the prepared sauce and stir-fry until everything is evenly coated and heated through.

Step 6: Serve
Serve hot over cooked rice.