Before you cook
Background Recipe story & origin
Blackened fish was invented by Chef Paul Prudhomme at K-Paul's Louisiana Kitchen in New Orleans in the 1980s. The technique involves dipping fish in melted butter, coating with a spice blend heavy on paprika and cayenne, then searing in a cast iron skillet heated to 500°F+. The extreme heat chars the spices into a black crust while keeping the fish moist inside. The dish became so popular that redfish was nearly fished to extinction, leading to catch limits. Today the technique is applied to many fish, chicken, and steaks.
Before you start Equipment you'll need
- cast iron skillet — Provides extremely high heat for blackening fish with proper char and crispy spice crust formation
Safety Safety & allergen notes
- This technique creates intense smoke; do outdoors or with strong ventilation.
- Cast iron must be extremely hot; handle with thick protection.
- Butter will smoke heavily; this is expected.
Non-negotiables Rules for success
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Heat cast iron to 500-550°F surface temperature.
Extreme heat (500°F+) creates the signature black crust in seconds
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Dip in butter before spices.
Butter helps spices adhere and creates the blackened crust
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Expect smoke.
Blackening creates intense smoke; this is normal and necessary
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Do not move the fish.
Let crust form before flipping; moving prevents blackening
Prep Get set first
About 8 min of prep
- Make or have Cajun spice blend ready
- Heat cast iron to 500-550°F
- Melt butter for dipping
- Pat fish very dry
- Open windows or cook outside
This creates serious smoke. Cook outside on a grill burner or under a strong hood. The technique works.
Ingredients
Instructions
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Make the spice blend
Mix paprika, cayenne, garlic powder, onion powder, thyme, oregano, salt, black pepper, and white pepper in shallow dish.
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Blacken the fish
Heat cast iron over highest heat 10 minutes until surface reaches 500-550°F (use infrared thermometer, or until a drop of water vaporizes instantly). Dip fish fillets in melted butter, then press into spice blend on both sides. Place in hot pan. Cook 2 minutes without moving until blackened. Flip and cook 2 minutes more. Drizzle with remaining butter. Serve with lemon wedges.
Chef's notes
Paul Prudhomme invented this technique at K-Paul's in New Orleans.
Redfish is traditional but any firm white fish works.
The spice blend can be made in advance.
This is best done outdoors on a propane burner.