Blackened Grilled Tilapia with Cajun Spice Rub

Blackened seasoning works wonderfully on white fish like tilapia, and it’s equally great on catfish, red snapper, shrimp, or even vegetables like zucchini and squash. You can use a store-bought blend or make your own homemade blackened seasoning for the best flavor.

What is Blackened Seasoning?

Blackened seasoning is a simple mix of spices—usually paprika, cayenne, garlic and onion powders, black pepper, and herbs—that creates a bold, smoky crust when cooked at high heat. Making your own blend lets you adjust heat and salt to taste, and it’s perfect on fish, chicken, steak, or roasted vegetables.

Ingredients

Full recipe quantities are listed in the recipe card below. In short, you need tilapia filets, blackened seasoning, and a small amount of oil to coat the fish and the skillet.

Substitution Ideas

• Blackened Seasoning: Use a homemade blend for best flavor or a store-bought version if preferred.
• Adjust the spice: Add more or less seasoning to suit your heat tolerance. Garlic powder, onion powder, cayenne or Cajun seasoning are great additions. A pinch of brown sugar balances the heat with a touch of sweetness.
• Oil or butter: Vegetable oil works well, but olive oil or melted butter are fine substitutes. Brushing melted butter on the fish before seasoning adds richness.
• Finishing: Squeeze fresh lemon over the cooked fish and garnish with pico de gallo and cilantro for brightness and freshness.

How to Make Blackened Tilapia on the Grill

• Step 1 — Oil the fish: Place tilapia on a plate and rub about 1 tablespoon of vegetable oil over both sides of each filet.
• Step 2 — Season: Spoon blackened seasoning over both sides of the fish, using roughly ½ tablespoon per filet or adjust to taste.

• Step 3 — Heat the grill: Preheat the grill to medium-high (about 400°F) and place a cast iron skillet on the grates to heat.
• Step 4 — Oil the skillet: Add the remaining oil to the hot cast iron skillet so it shimmers.
• Step 5 — Cook: Lay the tilapia in the hot skillet and cook undisturbed for 3 minutes to form a blackened crust.

• Step 6 — Flip and finish: Flip the filets and cook for another 2–3 minutes, until the internal temperature reaches 145°F and the fish flakes easily with a fork.
• Step 7 — Rest and serve: Transfer to a plate, let rest a few minutes, then serve warm with lemon and your choice of sides.

Recipe Tips

• Doneness: The fish is done when it flakes easily with a fork and reaches 145°F internally.
• Temperature: Bring tilapia to room temperature before grilling and cook quickly at high heat for best results.

What to Serve with Blackened Tilapia?

This is a light, healthy fish that pairs well with simple sides. Try a green salad, grilled corn on the cob, or grilled vegetables for an easy, low-carb meal.

• Green Salad
• Grilled Corn on the Cob in Husk
• Grilled Vegetables in Foil

Tilapia is a delicate, thin fish, so it can break apart if placed directly on grill grates. Cooking in a cast iron skillet or on foil prevents sticking and still captures the smoky grill flavor.

Store leftovers in an airtight container in the refrigerator for up to 4 days.