Prep the Beef: Start by slicing the beef thinly against the grain. This ensures it stays tender during cooking.
Marinate the Beef: In a bowl, combine the sliced beef, soy sauce, oyster sauce, and cornstarch. Let it marinate for at least 15 minutes while you prepare the broccoli.
Blanch the Broccoli: Bring a pot of water to a boil. Add the broccoli florets and blanch them for about 2 minutes until bright green. Drain and set aside.
Cook the Beef: Heat 1 tablespoon of vegetable oil in a large skillet over medium-high heat. Add the marinated beef in a single layer. Cook for about 3-4 minutes until browned and just cooked through. Remove from the skillet and set aside.
Make the Sauce: In the same skillet, add the remaining oil, minced garlic, and grated ginger. Sauté for about a minute until fragrant.
Combine Everything: Return the cooked beef to the skillet, along with the blanched broccoli. Toss to combine and cook for an additional 2-3 minutes.
Serve: Plate it up over rice or noodles, and enjoy!