This blackened fish recipe came out of a heat wave and a pineapple that was about to go. It was too hot to run the oven, I had two flounder fillets, and I wanted dinner in the time it takes to cook rice. Blackened fish gets a bad rap for being either bland or burnt to charcoal. Mine is neither. The fish is crisp and spiced on the outside, flaky inside, and the cold pineapple salsa on top does the one thing every good blackening needs: it cuts the heat with something bright.
Here's what nobody tells you: blackening is the spice blend and a hot pan, not some restaurant trick. You mix your own seasoning in two minutes, press it onto the fish, and sear. That's the whole move. If you already love the blackened shrimp pasta on the site, this is that same bold Cajun energy in a lighter, faster dinner. And if you're a salsa person, the pineapple here is a sweeter cousin of my homemade pico de gallo - lime and cucumber doing the heavy lifting instead of tomato.
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Blackened Fish Ingredients
Two short shopping lists - one for the fish, one for the salsa. Exact measurements are in the recipe card below.
For the blackened fish
- White fish fillets (flounder, or any flaky white fish)
- Oil for searing
For the homemade blackening seasoning
- Paprika
- Hot paprika
- Garlic powder
- Onion powder
- Dried thyme
- Dried oregano
- Ground cumin
- Cayenne pepper
- Red pepper flakes
- Salt
- Black pepper
For the fresh pineapple salsa
- Fresh pineapple, finely chopped
- Red onion, finely chopped
- Cucumber, finely chopped
- Fresh cilantro, finely chopped
- Lime
- Salt
Why You'll Love This Recipe
- Fast. Start to finish in about 20 minutes - quicker than takeout.
- You control the heat. More seasoning means more spice. Dial it to your table.
- No grill, no oven. One hot skillet on the stove does it all.
- Light but loaded. Lean fish, fresh fruit, big Cajun flavor. A healthy dinner that doesn't taste like one.
- Works with any white fish. Flounder, tilapia, cod, mahi - same method every time.
How to Make Blackened Fish
Mix, coat, sear, top. Make the salsa first so it can chill while the pan heats.
Mix the seasoning and coat the fish
Stir all the spices together in a small bowl. Pat the fillets dry, then press the seasoning all over both sides. The more you use, the spicier it gets.
Make the pineapple salsa
Combine the pineapple, red onion, cucumber, cilantro, lime juice, and salt. Stir and refrigerate so it stays cold.
Sear
Heat oil in a skillet over medium-high. Cook the fish about 3 minutes on the first side, then 2 minutes on the second, until the crust is dark and the fish flakes.
Top and serve
Spoon the cold pineapple salsa over the hot fish. Serve over rice.
Substitutions
- The fish: flounder is thin and quick, but tilapia, cod, snapper, or mahi all work. Thicker fillets just need a minute or two longer per side.
- Hot paprika: no hot paprika? Use all sweet paprika and bump the cayenne by a pinch.
- Cilantro: if cilantro tastes like soap to you, swap in flat-leaf parsley or fresh mint.
- Cucumber: a finely chopped bell pepper adds the same crunch with a little sweetness.
- Lime: lemon works in a pinch; it's a touch less tropical but still bright.
Variations
- Make it tacos. Flake the fish into warm tortillas and pile on the pineapple salsa.
- Add heat. Mince a little jalapeño or serrano into the salsa.
- Bowl it. Build a rice bowl with black beans, avocado, and the salsa.
- Swap the protein. The blackening seasoning is just as good on shrimp or chicken.
- Grill it. If the grill's already hot, sear the fillets over high heat instead of the skillet.
Equipment
- Cast iron skillet. Blackening needs a pan that gets screaming hot and holds it. Cast iron is the whole reason that crust forms.
- Fish spatula. Thin and flexible so you can flip a delicate fillet without tearing it.
- Sharp chef's knife. The salsa is only as good as your chopping. A sharp knife makes the fine dice fast.
- Glass mixing bowls. One for the spice blend, one for the salsa.
- Citrus juicer. Gets every drop out of that lime with no seeds.
Storage
- Store: keep leftover fish and salsa in separate airtight containers in the fridge for up to 2 days. Stored apart, the fish stays crisp-ish and the salsa stays fresh.
- Reheat: warm the fish in a dry skillet over medium for a couple minutes per side, or in a 350°F oven until just heated through. Skip the microwave - it steams the crust soft.
- Freeze: the cooked fish freezes for up to 1 month; thaw overnight in the fridge before reheating. Don't freeze the pineapple salsa - it turns watery. Make that fresh.
Top Tip
Pat the fish bone-dry before you season it. A wet fillet steams instead of searing, and you'll never get that dark, crisp blackened crust. Dry fish, hot pan, and don't move it once it's down.
Any firm, flaky white fish. Flounder, tilapia, cod, snapper, and mahi all blacken beautifully. Pick fillets of even thickness so they cook at the same rate.
It’s as spicy as you make it. The blend has cayenne and red pepper flakes, but the heat scales with how much seasoning you press on. Use a light hand for mild, a heavy one for bold - and the cold pineapple salsa tames whatever you choose.
It’s the best tool because it gets hot and stays hot, which is what builds the crust. Any heavy stainless skillet works too. Just avoid nonstick - it can’t take the high heat blackening needs.
Yes, up to a day ahead. It actually gets better as the lime and salt pull the juices together. Keep it cold and give it a stir before spooning it over the fish.
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📖 Recipe
Blackened Fish Recipe with Fresh Pineapple Salsa
- Total Time: 20 minutes
- Yield: 2 servings 1x
Description
Flaky blackened fish with a homemade Cajun seasoning, topped with bright, fresh pineapple salsa. An easy, healthy dinner ready in about 20 minutes - serve it over rice.
Ingredients
For the blackened fish:
- 2 (5 oz) white fish fillets (flounder or other flaky white fish)
- Oil, for searing
For the blackening seasoning:
- 2 tablespoons paprika
- 1 tablespoon hot paprika
- 1 tablespoon garlic powder
- 1 tablespoon onion powder
- 1 tablespoon dried thyme
- 1 tablespoon dried oregano
- ½ teaspoon ground cumin
- ¾ teaspoon cayenne pepper
- 1 teaspoon red pepper flakes
- 2 teaspoons salt
- 1 teaspoon black pepper
For the fresh pineapple salsa:
- 1 cup finely chopped fresh pineapple
- ¼ cup finely chopped red onion
- ½ cup finely chopped cucumber
- ¼ cup finely chopped fresh cilantro
- Juice of 1 large lime
- ¼ teaspoon salt
Get Recipe Ingredients
Instructions
- In a small bowl, stir together the paprika, hot paprika, garlic powder, onion powder, thyme, oregano, cumin, cayenne, red pepper flakes, salt, and black pepper.
- Pat the fish fillets dry with paper towels.
- Press the blackening seasoning all over both sides of each fillet. Use more for spicier fish.
- In a separate bowl, combine the pineapple, red onion, cucumber, cilantro, lime juice, and ¼ teaspoon salt.
- Stir the salsa and refrigerate so it stays cold.
- Heat a thin layer of oil in a skillet over medium-high heat.
- Add the fish and sear about 3 minutes, until the underside is dark and crisp.
- Flip and cook about 2 minutes more, until the fish flakes easily.
- Top the fish with the chilled pineapple salsa. Serve over rice.
Notes
- The more seasoning you press on, the spicier the fish-adjust to your heat preference.
- Make the salsa first so it has time to chill while the pan heats.
- Pat the fish completely dry for the best crust.
- Prep Time: 15 minutes
- Cook Time: 5 minutes
- Category: Dinner
- Method: Stovetop
- Cuisine: Cajun
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