Creating Beef Stir Fry with Vegetables is straightforward. Follow these simple steps for a perfect dish:

1. Prepare the Beef: Thinly slice the beef sirloin against the grain. This helps ensure tenderness.
2. Marinate the Beef: In a bowl, mix soy sauce, oyster sauce, and cornstarch. Add the beef and let it marinate for 10 minutes.
3. Prepare the Vegetables: Wash and chop your vegetables into bite-sized pieces.
4. Heat the Pan: In a large skillet or wok, heat the vegetable oil over medium-high heat until shimmering.
5. Cook the Beef: Add the marinated beef to the skillet in a single layer. Let it sear without stirring for 1-2 minutes, then stir-fry until browned and cooked through. Remove from the pan and set aside.
6. Stir-Fry the Vegetables: In the same pan, add a bit more oil if necessary. Add minced garlic and grated ginger; sauté for 30 seconds until fragrant. Then, add the mixed vegetables and stir-fry for 3-5 minutes until tender-crisp.
7. Combine Ingredients: Return the cooked beef to the skillet with the vegetables. Stir to combine and heat through.
8. Season: Add salt and black pepper to taste. If the mixture seems dry, add a splash more soy sauce.
9. Serve Hot: Remove from heat and garnish with sesame seeds and chopped green onions if desired.

By following these steps, you’ll have a delicious Beef Stir Fry that’s ready to impress!