Blackened Salmon Recipe

This Blackened Salmon recipe is a simple yet flavorful way to cook salmon. The Cajun seasoning used on the wild salmon in this dish adds heat. Blackened seasoning is very similar to Cajun seasoning and are often used interchangeably. The blackening process crisps the exterior of the fish and helps seal in moisture. The dark color of blackened salmon is actually a crust of charred spices, not from burning the fish, and this equals big flavor.

The blackened salmon fillets recipe is gluten-free, low carb and keto-friendly!

Blackened Salmon

This recipe is all about the blackening technique, where salmon is coated in a spice blend then seared in a hot cast iron skillet. The result? A perfectly blackened salmon with a crisp, flavorful crust and a tender, juicy interior. Whether you’re a seasoned cook or just starting out, mastering this cooking technique in your iron skillet will elevate your salmon game and impress at any dinner table.

Blackened fish is a favorite of Cajun cuisine, and a great way to prepare salmon. Blackening is a cooking method that originated in New Orleans and was popularized by chef Paul Prudhomme; it is distinct from grilling because it uses a specific spice blend to create its characteristic flavor and crust. The blackening technique can be used with various proteins, including firm-bodied fish, chicken, and steak. Typically, melted butter is applied to the surface of the fish and the blackening spices are adhered to that. As this is a fatty fish, I coated the Cajun seasoning directly on the salmon fillets and pan fried in a well oiled heavy cast iron skillet. Using a cast iron skillet helps achieve a crispy skin on the blackened salmon. For better results at high temperatures, use ghee or high-smoke-point oils like avocado oil. Blackened salmon is a quick and easy recipe that can be prepared in about 20 minutes. Blackened salmon fillets fit within a wide range of popular diets, as it is high protein, low carb and loaded with omega-3 oils.

Blackening is a particularity a good method when you wish to cook the fish more thoroughly, since the seasoning crust seals moisture in the salmon fillets and adds a ton of flavor. Of course, the method is also great when you want to cook your fresh salmon more rare too.

Try my Blackened Chicken too!

Choosing Salmon

Wild salmon is stronger and more muscular than farmed salmon because it has traveled greater distances, and it has a deeper, reddish-orange hue compared to the more pink color of farmed salmon, which is often much fattier due to living in a smaller, contained environment. Wild salmon may be more expensive, but it is worth it from both a health and quality standpoint.

Well thawed frozen salmon or fresh fillets are both perfectly fine for the recipe.

Understanding Blackening

Blackening is a classic cooking technique that transforms simple salmon fillets into a flavor-packed meal. The process starts by generously coating the fish with a spice mixture, often featuring smoked paprika, dried oregano, and a touch of thyme. Next, the salmon is placed in a hot skillet over high heat with a bit of ghee or high smoke point oil. This intense heat, combined with the spices, creates a signature blackened crust that’s smoky, slightly spicy, and absolutely delicious. Contrary to what the name suggests, blackening isn’t about burning the fish; it’s about developing a deep, savory flavor and a beautiful texture that makes blackened salmon a standout dish.

Is blackened salmon good for you?

Wild caught salmon is one of the best sources of essential Omega-3 Fatty Acids. The fish is also an excellent source of protein, potassium and B vitamins. It is good in general for brain and heart health too. As far as the blackening spices go, most have benefits. The only concern is sodium. If you are on a low sodium diet I suggest making your own blackening seasoning.  Simply reduce the amount of salt used in the recipe linked in the next paragraph or use salt substitute in the blend.

Blackening Seasoning

Blackening seasoning is pretty much interchangeable with Cajun seasoning.  A spice mix featuring paprika, cayenne pepper, onion powder, garlic powder, black pepper, salt, oregano and thyme. A little brown sugar can be added to the spice rub to help the fish caramelize when seared (I don't add it myself.). See my Cajun Seasoning recipe.

How to Make Blackened Salmon Fillets

Here is a simple visual guide to making blackened salmon. I know I find pictures helpful, when I make a recipe for the first time. Full printable recipe card below.

Tip: Let the salmon sit at room temperature for about 15 minutes before cooking to ensure even cooking.

Remove any stray scales or pin bones from your salmon fillets (or large fillet as shown) and pat dry. Then spoon on some of the seasoning.

Spread out the spices and pat gently to help them stick.

While you don't need to coat the skin side with the spice mixture, do dredge the edges.

Drop flesh side down into a hot cast iron skillet with a pool of oil in it. I use classic olive oil, ghee or avocado oil. Extra light would also work well, but DO NOT use extra virgin.

Do not move the salmon for the first 2–4 minutes to allow the crust to form properly before flipping.

Flip once the spices have started to blacken. Then reduce to medium heat and cook to your desired doneness. The salmon skin will crisp and keep your fish tender.

Tips and Tricks

For perfect blackened salmon every time, make sure your skillet is piping hot before adding the fish. Test it by flicking a few drops of water onto the surface; they should sizzle and evaporate instantly. Avoid overcrowding the pan, as this can lower the temperature and prevent that signature blackened crust from forming. If you’re cooking multiple fillets, work in batches for the best results. And remember, salmon cooks quickly and will continue cooking a little after removing from the skillet, so keep a close eye on it. These simple tips will help you achieve a blackened crust that’s crisp on the outside and perfectly tender inside.

Don’t forget to pat your salmon fillets dry before seasoning; excess moisture can steam the fish instead of searing it. Also allowing the fish to rest at room temperature for a few minutes before going into the cast iron skillet ensures even cooking.

What do you eat with blackened salmon?

This Blackened salmon recipe pairs well with a variety of sides to create a complete meal. Lemon and fresh herbs are commonly recommended to serve with blackened salmon for added flavor.

Great sides to team with this spicy salmon dish are broccoli au gratin, cheesy rice, crockpot corn casserole. sauteed vegetables or buttered corn. My blue cheese coleslaw would also make a flavorful and refreshing side for the fish.

For a drink choice, something refreshing and light, such as a sauvingnon blanc, Greyhound cocktail or Green Tea Lemonade would be nice.

Low Carb Sides for Blackened Salmon

When creating a low carb dinner with Blackened Salmon Fillets consider side dishes such as broccoli rabe, baked asparagus, cauliflower rice or roasted turnips. Finish the meal off with Keto Churros or Keto Pumpkin Cheesecake.

Check out my Keto Salmon dinner for more side dish options. Also keep in mind other fish, such as tilapia, catfish and Chilean Sea Bass can also be prepared with the blackening method.

Store Leftover Salmon

If you have leftovers, seal them in an airtight container and place in fridge promptly after cooling. The cooked salmon will last for 3-4 days according to the USDA.

The leftover spicy salmon would be a delicious addition (or swap) in my Cajun Pasta recipe. It would also make a yummy salmon salad, blackened salmon tacos or simply reheat and serve over rice or noodles.