Savory Beef and Vegetable Stir-Fry

1.In a bowl, combine the sliced beef, soy sauce, oyster sauce, cornstarch, salt, and pepper. Mix well and let it marinate for about 15 minutes.

2.Heat 1 tablespoon of vegetable oil in a large skillet or wok over medium-high heat. Add the marinated beef and stir-fry for about 3-4 minutes until browned. Remove the beef from the skillet and set aside.

3.In the same skillet, add the remaining tablespoon of vegetable oil. Add the minced garlic and sliced onion, and stir-fry for about 1-2 minutes until fragrant and the onion is translucent.

4.Add the sliced green and red bell peppers, julienned carrot, and potato strips to the skillet. Stir-fry for about 5-7 minutes until the vegetables are tender but still crisp.

5.Return the cooked beef to the skillet and add the diced tomato. Stir everything together and cook for an additional 2-3 minutes until heated through. Adjust seasoning with salt and pepper as needed.

6.Serve hot over steamed rice or noodles.