Rub steaks all over with 1 tablespoon olive oil, then season with salt and pepper. Set aside and let come to room temperature, approximately 30 minutes.

Preheat oven to 375 degrees. Cut brussels sprouts in half, then place in a medium bowl, add 1 tablespoon olive oil and balsamic vinegar and toss to coat brussels sprouts thoroughly. Spread brussels sprouts in a single layer on a baking sheet lined with aluminum foil and bake in oven 15 minutes, then remove and flip brussels sprouts over to roast the other side. Cook for an additional 10-15 minutes until fork tender.

While brussels sprouts are roasting (and after you've already turned them), coat grill with olive oil and heat to high heat (450-500 degrees). Rub remaining olive oil on mango slices. Add steaks to grill and grill for 4-5 minutes per side for medium rare. After flipping the steaks, add mango and grill on each side for approximately 2-3 minutes.

Garnish each mango with chile garlic sauce, then serve immediately.