Grilled Blackened Mahi-Mahi
Get ready for a flavor explosion with perfectly blackened Mahi-Mahi straight from your grill!

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Ingredients
- 4 Mahi-Mahi fillets (6 oz each), skin off
- 2 tbsp unsalted butter, melted
- 2 tbsp blackening seasoning (store-bought or homemade)
- 1 tbsp olive oil
- 1 lemon, cut into wedges, for serving
- Fresh parsley, chopped, for garnish
Instructions
- 1
Preheat your grill to high heat (450-500°F). For best blackening, a cast-iron griddle or plancha works wonders placed directly on the grates, but direct grill grates are fine.
- 2
Pat the Mahi-Mahi fillets very dry with paper towels; this is crucial for a good sear and crust.
- 3
Brush each fillet generously with melted butter on all sides, ensuring full coverage.
- 4
Sprinkle the blackening seasoning evenly and liberally over both sides of each fillet, pressing it gently to adhere.
- 5
Lightly oil your grill grates or the cast-iron griddle with olive oil to prevent sticking.
- 6
Place the seasoned fillets directly on the hot grill or griddle. Cook for 3-4 minutes per side, without moving, until a dark, crusty 'blackened' sear forms.
- 7
The fish should flake easily when done, reaching an internal temperature of 140-145°F.
- 8
Remove from the grill and let rest for a couple of minutes before serving with fresh lemon wedges and a sprinkle of chopped parsley.
Why this recipe works best on a clean grill
A clean grill makes this recipe easier because the grates release food evenly, the heat moves predictably, and old grease does not smoke over the fresh ingredients. When carbon buildup sits on the grate, it can leave bitter flavors, create flare-ups, and make delicate foods stick right when they should sear.
Before cooking, preheat the grill fully, scrape the grate with a bristle-free tool, and lightly oil the surface. If your grill has yellow flames, heavy smoke, stubborn hot spots, or a greasy smell before the food goes on, it may need a deeper cleaning before your next cookout. For more context, read our clean grill benefits guide or request a professional quote from The Grill Guyz.
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