Creating Kung Pao Beef can be an enjoyable and straightforward process if you follow these simple steps:

1. Marinate the Beef: In a bowl, combine the sliced flank steak with soy sauce and cornstarch. Mix well and let it marinate for about 10 minutes.
2. Heat the Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat.
3. Cook the Beef: Add the marinated beef to the skillet in a single layer. Sear for about 2-3 minutes until browned, then remove and set aside.
4. Sauté Vegetables: In the same skillet, add the bell pepper, zucchini, and snap peas. Sauté for 3-4 minutes until vibrant and slightly tender.
5. Add Aromatics: Stir in the minced garlic and ginger. Cook for about 1 minute until fragrant.
6. Combine Ingredients: Return the beef to the skillet and add the hoisin sauce, rice vinegar, sesame oil, and red pepper flakes. Stir well to combine all ingredients.
7. Finish Cooking: Allow the mixture to cook for an additional 2-3 minutes, ensuring the beef is cooked through and the sauce is well incorporated.
8. Add Peanuts: Stir in the roasted peanuts and mix until evenly distributed.
9. Season: Taste and adjust seasoning with salt and pepper as necessary.
10. Garnish and Serve: Remove from heat and garnish with chopped green onions before serving.

These steps will guide you in creating this incredible dish with ease.