Beef stir-fry is a quick and flavorful meal that can be made in minutes. Start by marinating thinly sliced beef in a mixture of soy sauce, garlic, ginger, and sesame oil. Heat a wok or skillet, add the beef and stir-fry until cooked to your liking. Add your favorite vegetables like bell peppers, broccoli, and carrots, and cook until tender-crisp. Serve over rice or noodles for a satisfying meal.