In a small bowl, mix soy sauce, oyster sauce, hoisin sauce, rice vinegar, and cornstarch.
Stir until the cornstarch dissolves and the sauce is smooth.
Cook the Beef:
Heat a wok or large skillet over medium-high heat and add vegetable oil.
Once the oil is hot, add the sliced beef in batches, cooking each side for about 2-3 minutes until browned and cooked through. Remove the beef from the pan and set aside.
Stir-Fry the Vegetables:
In the same pan, add a little more oil if needed. Sauté garlic and ginger for about 1 minute until fragrant.
Add the carrots, bell pepper, and snow peas, and stir-fry for 3-4 minutes, until the vegetables are tender but still crisp.
Combine Beef and Sauce:
Add the beef back to the pan, followed by the prepared sauce.
Stir everything together, cooking for another 2-3 minutes until the sauce has thickened and coats the beef and vegetables.
Garnish and Serve:
Garnish with sesame seeds and sliced green onions.
Serve hot over steamed rice or noodles for a complete meal.
