Creating this incredible Sesame Beef is straightforward if you follow these simple steps:

1. Marinate the Beef: In a bowl, combine the sliced beef, soy sauce, and cornstarch. Let it marinate for about 10 minutes.
2. Prepare the Sauce: In a small bowl, mix together the sesame oil, sugar, rice vinegar, and garlic. Set aside.
3. Heat the Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat.
4. Cook the Beef: Add the marinated beef to the skillet, cooking until browned and cooked through, about 3-4 minutes. Remove the beef and set it aside.
5. Stir-Fry the Vegetables: In the same skillet, add the bell pepper and broccoli. Stir-fry for about 2-3 minutes until they are tender-crisp.
6. Add Garlic and Ginger: Stir in the minced garlic and ginger, cooking for an additional minute until fragrant.
7. Combine: Return the cooked beef to the skillet with the vegetables. Pour the prepared sauce over the mixture.
8. Finish Cooking: Stir everything together and cook for another 2-3 minutes until the sauce thickens and coats the beef and vegetables.
9. Add Sesame Seeds: Sprinkle the sesame seeds over the dish and toss to combine.
10. Garnish: Remove from heat and garnish with sliced green onions before serving.

These steps will guide you in creating this amazing Sesame Beef effortlessly.