Follow these easy steps to create your own Chinese Beef and Broccoli:

1. Prepare the Beef: Slice the flank steak thinly against the grain. This will ensure tenderness.
2. Marinate: In a bowl, mix sliced beef with soy sauce, cornstarch, and sesame oil. Let it marinate for about 10 minutes.
3. Heat the Pan: In a large skillet or wok, heat vegetable oil over medium-high heat.
4. Cook Beef: Add the marinated beef to the pan. Stir-fry until browned and nearly cooked through, about 3-4 minutes. Remove the beef from the pan and set aside.
5. Sauté Garlic and Ginger: In the same pan, add minced garlic and ginger. Sauté for about 30 seconds until fragrant.
6. Add Broccoli: Toss in the broccoli florets. Stir-fry for 3-4 minutes until bright green and tender-crisp.
7. Combine Ingredients: Return the beef to the pan. Pour in beef broth and oyster sauce. Stir well to combine.
8. Thicken the Sauce: Allow the mixture to simmer for about 2-3 minutes until the sauce thickens slightly.
9. Serve: Once everything is heated through, remove from heat and serve over cooked rice or noodles.

These straightforward instructions will help you whip up the most incredible Chinese Beef and Broccoli in no time at all.