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Keto Dinner

Blackened Fish

Blackened fish has become my weeknight hero—it’s quick, packed with smoky flavor, and keeps carbs at zero. This recipe transforms simple trout fillets into a bold, buttery dish that tastes like it came from a fancy Louisiana kitchen.

15 min Prep time 20 min Cook time 35 min Total time 6 Servings 390 Calories
Blackened Fish

Ingredients

  • tablespoon paprika
  • teaspoons dry mustard
  • teaspoon cayenne pepper
  • teaspoon ground cumin
  • teaspoon black pepper
  • teaspoon white pepper
  • teaspoon dried thyme
  • teaspoon salt
  • /4 cup unsalted butter melted
  • ounce trout fillets
  • /4 cup unsalted butter melted

Instructions

  1. Step 1

    Start by combining the paprika, dry mustard, cayenne, cumin, black pepper, white pepper, thyme, and salt in a small bowl. I like to whisk them together so every bite gets an even hit of flavor. Next, pour the 3/4 cup of melted butter into a shallow dish. One by one, dip each trout fillet into the butter, flipping to coat both sides generously. Then, sprinkle the spice blend over the buttered fillets, patting gently so the seasoning sticks. No need to rub—just a light press does the trick. Meanwhile, get your cast iron skillet screaming hot over high heat for about 10 minutes. A good sear is what creates that signature blackened crust. Place the fillets in the hot pan, making sure not to crowd them. Spoon about a teaspoon of the remaining melted butter over each piece. Let them cook undisturbed for roughly 2 minutes, until the underside looks deep brown and charred. Flip carefully, add another teaspoon of butter on top, and cook for 2 more minutes. Repeat with any remaining fillets, working in batches if needed. Serve immediately while the butter is still sizzling.

Chef's Tip

I always warm the spice mix in a dry skillet for 30 seconds before blending—it awakens the oils and deepens the smoky notes without extra heat.

Storage Tips

Keep leftover blackened fish in a sealed container in the fridge for up to three days. To revive the crispness, reheat in a hot skillet with a touch of butter.

Variation Tips

Try this with salmon or halibut for a twist. Pair it with a crisp cucumber salad or roasted asparagus to round out the meal without adding extra carbs.

Frequently Asked Questions