Blackened Salmon with Lemon Butter
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Turn on the vent fan, because the smoke alarm is going to have an opinion. What comes out of the cast-iron skillet is a dark, spiced crust, a juicy center, and lemon butter on top, in about twenty minutes.
The short version
Rub salmon fillets with melted butter and a smoky Cajun spice blend, sear in a very hot cast-iron skillet for 3 to 4 minutes on one side and 2 to 3 on the other, and squeeze lemon over the top. Turn on the vent fan and don't move the fish while it sears.
What makes ours better
what we fixed so you don’t have to
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Mix your own spice blend. Five minutes with the pantry gives you a blend that's fresher and less salty than the jar, and you control the heat. Paprika is the base, so most of the color comes from it.
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Coat the fish in butter, not oil. Melted butter holds the spices against the fish and toasts them as it hits the pan. Oil sits on the surface and lets the spice fall off.
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Let the skillet get truly hot. Five minutes over high heat gives you the crust in a few minutes, before the center overcooks. A lukewarm pan steams the spice into a paste.
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Finish with lemon butter. A spoonful of melted butter and lemon juice over the seared fish cools the heat and brightens the char.
What you need
the usual suspects
- Sweet paprika1 tablespoon
- Dried thyme1 teaspoon
- Salmon fillets1½ pounds
- Unsalted butter4 tablespoons
- Lemon1 large
Blackening spice
Salmon
yes, all of the butter
Steps
deep breath. you’ve got this.
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Dry the salmon
Pat the fillets very dry with paper towels. Take them out of the fridge 10 minutes before cooking so the chill comes off. Melt the butter in a small bowl in the microwave.
Wet fish steams. A dry surface is what gives you a crust.
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Mix the spice
Stir all the spice ingredients together on a plate. Brush the tops, bottoms and sides of the salmon with about 2 tablespoons of the melted butter, then press each fillet into the spice until coated on every side. Set them aside for 5 minutes.
About 5 min. Cook mode has a timer for this step.
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Heat the skillet
Open a window and turn on the vent fan. Set a 12-inch cast-iron skillet over high heat for 5 minutes, until a drop of water skitters and vanishes at once. Add the oil and swirl.
Blackening makes smoke. That's expected, but it's no reason to turn the heat down.
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Sear the first side
Lay the fillets in the skillet, presentation side down, with space between them. Cook for 3 to 4 minutes without touching them, until the underside is deep brown and the edge of the fish has turned opaque about halfway up the side.
About 4 min. Cook mode has a timer for this step.
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Flip and finish
Turn the fillets with a thin spatula and cook for 2 to 3 minutes more. The salmon should flake at the thickest part and read 125°F to 130°F for medium; cook to 145°F if you like it fully done. Move it to a plate.
Thin tail pieces cook faster, so pull them first.
About 3 min. Cook mode has a timer for this step.
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Finish with lemon butter
Stir the lemon juice into the remaining 2 tablespoons melted butter and spoon it over the fish. Rest it for 2 minutes, then serve with lemon wedges and parsley.
Good to know
read this before somebody asks for seconds
- The blend makes about 3 tablespoons, enough for 4 fillets with a little left over. Double it and keep it in a jar for chicken, shrimp or pork chops.
- No cast iron? Use a heavy stainless skillet. Nonstick isn't safe at this heat, so skip it.
- For less smoke, use ghee or clarified butter for the pan oil. Whole butter burns at the temperature you need.
- Thicker fillets can go into a 400°F oven for 3 to 5 minutes after the sear if the center is still translucent.
- Storage. Refrigerate cooked salmon in an airtight container for up to 3 days. Eat it cold over salad or warm gently in a low oven, since the microwave dries it out.
Questions, answered
the questions my cousins text me
Is blackened salmon burnt?
No. The dark crust is toasted spices and browned milk solids. If it smells acrid or bitter, the pan was too hot for too long or the spice was too fine and scorched, so shorten the sear next time.
Do I have to use cast iron?
Cast iron holds the heat best and gives the deepest crust. A heavy stainless pan works too. Avoid nonstick at this temperature.
What internal temperature is salmon done?
125°F to 130°F is medium and still moist. The USDA number is 145°F, which is firmer. Salmon keeps cooking for a minute or two after you take it off the heat.
How do I stop the smoke alarm going off?
Open a window, run the vent fan, use ghee in the pan, and don't overcrowd. Even then some smoke is normal.
Can I use frozen salmon?
Yes, but thaw it overnight in the fridge and pat it very dry. Wet thawed fish won't develop a crust.
Can I bake blackened salmon instead?
You can, at 425°F on a lined sheet for 10 to 14 minutes, but you won't get the dark crust. Sear it if you can.
From the table
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Published October 29, 2026.