Preheat oven broiler and a line sheet pan with parchment paper or foil, set aside.
Place fillets onto a prepared sheet pan and drizzle 1 tsp. oil over, flipping until coated. Then, season with salt and pepper. Place onto upper rack and let broil 10-12 minutes or until cooked.
While that is cooking, prepare mango relish by heating a saucepan over medium-high heat. Then add remaining teaspoon oil, red onion, and garlic — sauté ~3 minutes. Add coconut aminos, mango, lime juice — sauté ~2 minutes or until liquid has slightly thickened, stirring often to prevent mango from burning/sticking to the pan.
Top fillets with mango relish and cilantro alongside asparagus, rice, and lime wedges — store and enjoy!