Creating the amazing 30-Minute Mongolian Beef is as simple as following these easy steps:

1. Prepare the Beef: In a bowl, toss the thinly sliced flank steak with cornstarch until evenly coated. Let it sit for about 5 minutes.

2. Heat the Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat until hot but not smoking.

3. Cook the Beef: Add the beef to the skillet in a single layer. Cook for about 2-3 minutes until browned, flipping halfway. Remove the beef from the skillet and set aside.

4. Sauté Garlic and Ginger: In the same skillet, add the minced garlic and grated ginger. Sauté for about 30 seconds until fragrant.

5. Make the Sauce: Pour in the soy sauce and sprinkle the brown sugar into the skillet. Stir to combine and bring the mixture to a simmer.

6. Return the Beef: Add the cooked beef back into the skillet, tossing to coat it thoroughly in the sauce. Cook for an additional 2-3 minutes until heated through.

7. Garnish: Remove from heat and garnish with chopped green onions and sesame seeds, if desired.

8. Serve: Pair the Mongolian beef with rice or noodles for a complete meal.

With these straightforward steps, anyone can prepare a delicious dish that is bound to impress!