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posted April 28, 2021

Grilled Mahi Mahi with Blackened Seasoning

Coated with a blackened seasoning and grilled to perfection, this Grilled Mahi Mahi is an amazingly delicious piece of fish that is simple, satisfying, and ready in under 30 minutes!

Two grilled mahi mahi filets on a plate surrounded by broccoli, rice, and lemon wedges with text overlay - Grilled Mahi Mahi.

Grilled Mahi Mahi

Mahi Mahi (also known as common dolphinfish or dorado) is a very mild white-fleshed tropical fish. It has a great, firm texture that makes it perfect for grilling.

Due to its mild flavor, it lends itself well to some good seasoning with lots of flavor. The blackened seasoning is a great compliment to the flavor of the fish, giving it a smoky, spicy punch.

Four uncooked mahi mahi filets on a metal baking dish.

Grilled Mahi Mahi Seasoning

This mahi mahi is seasoned with my awesome Blackened Seasoning. It’s a Cajun-style seasoning with salt pepper, smoked paprika, cayenne, and herbs. Check out the linked post for more info on this awesome seasoning. 

Blackened seasoning goes great with mahi mahi. It’s not too sweet or overpowering. It’ll enhance the flavor of the mahi mahi while giving it a robust flavor with some decent heat. 

Blackened seasoning on four mahi mahi filets on a metal plate.

How to Grill Mahi Mahi

Alright, let’s get to the process on grilling mahi mahi. It’s extremely easy to grill fish, and mahi mahi is no exception. Simply season, grill, and serve. 

  1. Season. Brush the mahi mahi filets with melted butter and season them on all sides with the Blackened Seasoning.
  2. Grill. Preheat your grill to 425 degrees F. While the grill is preheating dip a paper towel in avocado oil (or another high heat oil) and place it between tongs. Brush the oil over the grill grates. Once the grill is preheated and oiled, place the seasoned mahi mahi directly on the grill grates and grill for 6 minutes per side or until the internal temperature of the fish reaches 145 degrees F.
  3. Serve. Remove the fish from the grill and serve immediately. This fish goes great with a side of rice and Grilled Broccoli. Make sure to serve with lime wedges, and you’ve got a fantastic meal on your hands.

Make sure to scroll to the bottom of this post for a full printable recipe!

Grilled mahi mahi seasoned with homemade blackened seasoning on a wood plate.

How Long to Grill Mahi Mahi

It takes approximately 10-15 minutes to grill mahi mahi. For this recipe (using 6-ounch mahi mahi filets), it took around 6 minutes per side to grill the fish. 

I highly recommend monitoring the temperature of the mahi mahi while it is on the grill. Always grill your meat and seafood to temperature and not to time, using time as a guideline only. Investing in a good internal meat thermometer (my favorites are the ThermoPop or Thermapen Mk4 from ThermoWorks). Once your fish reaches an internal temperature of 145 degrees F, you are good to remove the fish from the grill.

Two grilled mahi mahi filets on a wood plate surrounded by broccoli, rice, and lemon wedges.

More Grilled Seafood Recipes

You can never go wrong with seafood for dinner (or lunch, or just about anytime the craving hits). From salmon to swordfish, Hey Grill Hey has a handful of grilled seafood recipes you’ll love.

Grilled Mahi Mahi Recipe

Two grilled mahi mahi filets on a plate surrounded by broccoli, rice, and lemon wedges.

Grilled Mahi Mahi with Blackened Seasoning

Susie Bulloch (heygrillhey.com)
Coated with a blackened seasoning and grilled to perfection, this Grilled Mahi Mahi is an amazingly delicious piece of fish that is simple, satisfying, and ready in under 30 minutes!
Prep Time : 15 mins
Cook Time : 12 mins
Total Time : 27 mins
Servings : 4 people
Calories : 264kcal

Ingredients
 

  • 4 mahi mahi filets (about 6 ounces each)
  • 2 Tablespoons butter (melted)
  • 2 Tablespoons Blackened Seasoning
  • 2 Tablespoons avocado oil
  • 1 lemon (cut into wedges)

Instructions

  • Preheat. Preheat your grill to 425 degrees F.
  • Season the mahi mahi. Brush the mahi mahi filets with the melted butter. Season the mahi mahi on all sides with the blackened seasoning.
  • Oil the grill grates. Fold a paper towel and pinch it with a pair of tongs. Submerge the paper towel in 2 Tablespoons of a high heat cooking oil (like avocado oil, rapeseed oil, melted ghee or melted beef tallow). The paper towel should be saturated, but not dripping Brush the oiled paper towel lightly over your grill grates.
  • Grill the mahi mahi. Place the seasoned mahi mahi filets on the oiled grill grates. Close the lid and cook for 6 minutes. Open the lid to flip the filets. Use a metal spatula and lightly lift the filets to separate them from the grates. You will only flip the fish once. Close the lid and continue to grill the mahi mahi for 6 minutes on the second side. Open the lid and check the mahi mahi for doneness. You want the filets to read 145 degrees F internal temperature.
  • Serve with lemon. Carefully remove your mahi mahi filets from the grill and transfer to your serving platter. Serve with fresh lemon wedges and enjoy.

Nutrition

Calories: 264kcal | Carbohydrates: 3g | Protein: 32g | Fat: 14g | Saturated Fat: 5g | Trans Fat: 1g | Cholesterol: 139mg | Sodium: 733mg | Potassium: 746mg | Fiber: 1g | Sugar: 1g | Vitamin A: 487IU | Vitamin C: 14mg | Calcium: 34mg | Iron: 2mg
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