01 - Preheat grill to medium-high heat (about 400°F).
02 - Pat mahi mahi fillets dry with paper towels. Brush both sides with olive oil and season with sea salt and black pepper.
03 - In a food processor or blender, combine mango, lime zest and juice, softened butter, honey, minced garlic, chili flakes (if using), cilantro, and a pinch of salt. Blend until smooth and creamy. Set aside.
04 - Lightly oil grill grates. Place mahi mahi fillets on grill and cook for 4-6 minutes per side, depending on thickness, until fish is opaque and flakes easily with a fork.
05 - During the last minute of grilling, spoon a little mango lime butter over each fillet to melt.
06 - Remove fish from grill and transfer to serving plates. Top with more mango lime butter and garnish with fresh cilantro and lime wedges.
07 - Serve immediately with your favorite tropical sides.