1. In a large skillet, heat olive oil over medium-high heat. Add the sliced flank steak, season with salt and pepper, and cook until browned, about 5-7 minutes. Remove from the skillet and set aside.
2. In the same skillet, add garlic and ginger, sautéing for about 1 minute until fragrant.
3. Stir in the sweet chili sauce, soy sauce, and rice vinegar. Let the mixture simmer for 2-3 minutes until slightly thickened.
4. Return the cooked beef to the skillet, along with the sliced red bell pepper and broccoli florets. Toss everything together to coat in the sauce, cooking for an additional 4-5 minutes until the vegetables are tender-crisp.
5. Serve the beef and vegetables over a bed of warm jasmine rice. Top with sesame seeds and green onions for garnish.

Remember to keep an eye on the sauce as it can thicken quickly. Adjust the seasoning to your taste, adding more soy sauce or vinegar if needed. Cooking is all about finding your personal preference, so don’t hesitate to make it your own!