Blackstone Mahi Mahi (Blackened or Citrus Herb)

Mahi mahi is built for the Blackstone. It’s firm enough to flip without falling apart, has just enough fat to stay moist under high heat, and takes seasoning extremely well — both bold Cajun blackening and lighter citrus-herb preparations. The flat-top gives you the same dark, spiced crust that blackened fish restaurants achieve with cast iron, but with more surface area and more consistent heat.

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Ingredients

Option A: Blackened Mahi Mahi

• 4 mahi mahi fillets (6 oz each, about ¾–1 inch thick)
• 3 tbsp butter or avocado oil
• 2 tsp smoked paprika
• 1 tsp cayenne pepper
• 1 tsp garlic powder
• 1 tsp onion powder
• 1 tsp dried thyme
• ½ tsp dried oregano
• 1 tsp salt
• ½ tsp black pepper

Option B: Citrus Herb Mahi Mahi

• 4 mahi mahi fillets (6 oz each)
• 2 tbsp avocado oil
• 1 tsp garlic powder
• 1 tsp dried basil or Italian seasoning
• Zest of 1 lemon + zest of 1 lime
• Salt and white pepper
• 2 tbsp butter to finish

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Instructions

For Blackened Mahi Mahi

Step 1: Mix all the blackening spices together in a small bowl. Pat mahi mahi fillets dry. Coat both sides generously with the spice mix, pressing it in.

Step 2: Bring the griddle to medium-high (375–400°F). Add butter to the cooking zone.

Step 3: Place fillets in the butter. Cook without touching for 4 minutes — the spices will look dark and develop a slightly charred crust. This is correct — it’s “blackened,” not burnt.

Step 4: Flip once. Cook 3–4 more minutes until just opaque throughout and reading 145°F internal temperature.

Step 5: Serve with lime wedges, over rice or in fish tacos.

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For Citrus Herb Mahi Mahi

Step 1: Pat fillets dry. Brush with avocado oil. Season with garlic powder, dried basil, lemon and lime zest, salt, and white pepper.

Step 2: Preheat griddle to 375°F. Add avocado oil.

Step 3: Sear first side 4–5 minutes until golden.

Step 4: Flip. Add a pat of butter alongside each fillet. Cook 3–4 more minutes, spooning the melting butter over the top of the fish to baste.

Step 5: Squeeze lemon over the finished fish. Serve with fresh herbs.

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Tips

Blackened = bold. The blackening spice amount looks like a lot, but mahi mahi is firm and mild enough to handle it. Don’t be shy — a light dusting isn’t blackened fish.

Don’t move it early. Mahi mahi has collagen-rich flesh that grips the steel until the crust forms. Waiting 4 minutes before checking ensures clean release.

Fish tacos. Blackened mahi mahi makes exceptional fish tacos — flake after cooking, stuff into corn tortillas with shredded cabbage, lime crema, and avocado.

Internal temp. 145°F is the safe temperature for mahi mahi. At 145°F the flesh should be opaque white and flake cleanly in large chunks — not stringy, not translucent.

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The 5-Minute Mango Salsa

Blackened mahi and mango salsa is a classic pairing for a reason — the sweet heat balances the Cajun crust. While the griddle preheats: dice 1 ripe mango, ¼ red onion (fine), and a handful of cilantro; toss with the juice of 1 lime and a pinch of salt. Add minced jalapeño if you want it to bite back. Spoon over the fish or into tacos.

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Buying Mahi Mahi

Mahi is almost always sold as skinless fillets, fresh in coastal markets and frozen everywhere else — and the frozen is genuinely good, since most of it is processed at sea. Look for fillets ¾ to 1 inch thick with a pinkish-to-ivory color; a strong fishy smell or gray-brown bloodline that’s turned dull means it’s past its best. Thaw frozen fillets overnight in the fridge and pat them very dry — the blackening rub only crusts on a dry surface.

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What to Serve With It

The blackened version wants cooling sides: the mango salsa above, rice, or elotes if you’re leaning into the street-food angle. The citrus-herb version pairs cleaner — asparagus or zucchini off the same griddle, or sweet potatoes whose caramelized edges echo the citrus.

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Storage and Reheating

Mahi’s firmness makes it one of the better-reheating fish: refrigerate up to 3 days, then rewarm covered on a low zone with a splash of water for 2–3 minutes. It also holds its texture cold, which is why leftover blackened mahi is the best next-day fish taco filling on this site — no reheating required, just warm tortillas.

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More flat-top recipes: Blackstone Fish Recipes · Blackstone Dinner Ideas · Blackstone Mexican Recipes

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Frequently Asked Questions

What temperature do you cook mahi mahi on a Blackstone griddle?

375–400°F — medium-high heat. High enough to develop the crust (essential for blackened mahi mahi), but controlled enough to cook through to 145°F without drying out the flesh.

How long does mahi mahi take on a Blackstone?

4–5 minutes per side for ¾-to-1-inch thick fillets — about 8–10 minutes total. Check internal temperature at 8 minutes. Mahi mahi is done when it reaches 145°F and flakes in large, clean pieces.

Is mahi mahi good for fish tacos?

Excellent. Blackened mahi mahi is one of the most popular fish taco proteins. Cook on the Blackstone with Cajun seasoning, then flake it into corn tortillas with cabbage slaw, lime crema, and pico de gallo. The texture holds up better in tacos than delicate fish like tilapia.