Tulo

Blackened Redfish

A charred, deep-red-black spiced redfish fillet in a cast iron skillet, with a lemon wedge and pat of melted butter on top.
Photo by Milton Das on Pexels

A very hot, dry cast iron skillet combined with a butter coating is what turns the spice rub black without burning it to ash; the butter carries the spices, browns quickly, and forms the signature dark, slightly crisp crust while the fish underneath stays moist because the sear time is so short.

Prep
10 min
Cook
10 min
Total
20 min
Servings
4

Ingredients

Servings4
  • 4 6-oz fillets redfish fillets (or red snapper)
  • 6 tbsp unsalted butter, melted
  • 1 tbsp paprika
  • 2 tsp cayenne pepper
  • 1 tbsp garlic powder
  • 1 tbsp onion powder
  • 1 tsp dried oregano
  • 1 tsp dried thyme
  • 1 tsp black pepper, freshly ground
  • 1/2 tsp white pepper
  • 1 tsp kosher salt

Nutrition per serving

Calories
318
Protein
31g
Carbs
5g
Fat
20g

Based on the recipe as written, one serving. Recalculates if you swap an ingredient above. An estimate only, exact values depend on the specific ingredients used.

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Instructions

  1. 1In a small bowl, combine the paprika, cayenne, garlic powder, onion powder, oregano, thyme, black pepper, white pepper, and salt to make the blackening seasoning.
  2. 2Pat the redfish fillets completely dry with paper towels on both sides.
  3. 3Heat a large cast iron skillet over high heat until it just starts to smoke lightly, 5-7 minutes; turn on a range hood or crack a window, since blackening produces heavy smoke by design.
  4. 4Dip each fillet in the melted butter to coat both sides, letting the excess drip back into the bowl.
  5. 5Press both sides of each buttered fillet firmly into the spice blend so it's coated heavily and evenly, patting gently to help it adhere.
  6. 6Carefully lay the fillets in the smoking-hot skillet without crowding (work in batches if needed), and drizzle a little of the remaining melted butter over the top of each.
  7. 7Sear undisturbed for 2-3 minutes, until the underside is deeply charred and black; resist the urge to move the fillets before the crust sets.
  8. 8Flip and sear the second side for another 2-3 minutes, until the fish flakes easily with a fork and reaches an internal temperature of 137-140°F.
  9. 9Remove from the skillet immediately and serve hot with lemon wedges.

Tips & variations

  • Use cast iron, not stainless or nonstick; only cast iron holds enough heat to keep blackening the spices for the full sear without cooling down.
  • This method smokes heavily on purpose. Cooking it on an outdoor burner or under a strong range hood keeps the kitchen from filling with smoke.
  • Redfish can be hard to find outside the Gulf Coast; red snapper, catfish, or drum fillets all take the blackening treatment well as substitutes.
  • Dial the cayenne down to 1 teaspoon for a milder crust, or add a pinch of ground chipotle for a smokier heat.
  • Cut fillets no thicker than about 3/4 inch so the inside cooks through in the same time it takes the crust to blacken.

Storage & reheating

Refrigerate leftover fillets in an airtight container for up to 2 days. Reheat gently in a dry skillet over medium-low heat just until warmed through, since high heat or a microwave will dry the fish out and soften the crust. Blackened fish doesn't freeze well; the crust turns soft and the fillet flakes apart on thawing.

Tips from the Tulo kitchen

  • Set up the melted butter and spice blend in shallow dishes right next to the stove before the skillet even goes on the heat, since once it's smoking hot there's no time to prep.
  • A splatter screen isn't useful here since the fillets need direct contact with the dry pan, but keeping tongs and a spatula within reach avoids fumbling once the smoke starts.

FAQ

Why does blackened fish need to smoke so much while cooking?

The dark crust comes from the milk solids in the butter and the paprika-heavy spice blend charring almost instantly on contact with the very hot dry skillet; that charring is what produces the smoke, and it's unavoidable with this method.

Can I make blackened redfish without a cast iron skillet?

A carbon steel skillet can work in a pinch, but thinner stainless or nonstick pans don't retain enough heat and will cool down as soon as the fish hits them, leaving the spices pale instead of charred.

Is blackened redfish very spicy?

It's noticeably peppery from the cayenne and black pepper, but the butter coating mellows it. Cutting the cayenne to 1 teaspoon keeps most of the flavor with much less heat.

How do I know when the redfish is done?

The flesh turns opaque and flakes easily with a fork, and an instant-read thermometer inserted at the thickest part should read 137-140°F, since it will climb a few more degrees after coming off the heat.

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