Cajun-Spiced Blackened Salmon with Lemon Butter Sauce

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

Salmon fillets coated in bold Cajun spices and pan-seared to a smoky crust, served with a tangy lemon butter sauce. This american-inspired seafood ready in about 15 minutes pairs salmon fillets, cajun seasoning, unsalted butter for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 410 calories and feeds 2, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 5 min Cook: 10 min Serves 2 American cuisine 410 cal/serving
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Ingredients

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Instructions

  1. Step 1: Pat dry 2 salmon fillets and season both sides with 2 tbsp Cajun seasoning, 1/2 tsp salt, and 1/4 tsp black pepper.
  2. Step 2: Heat 1 tbsp olive oil in a large skillet over medium-high heat until hot but not smoking. Place salmon skin-side down and cook for 4 minutes without moving until the edges are crispy.
  3. Step 3: Flip salmon and sear the other side for 3 minutes until the fish is cooked through and has a blackened crust.
  4. Step 4: Remove salmon and reduce heat to medium-low. Add 3 tbsp unsalted butter and 2 tbsp fresh lemon juice to the pan, stirring to create a smooth lemon butter sauce.
  5. Step 5: Spoon the lemon butter sauce over the salmon fillets before serving.

Frequently asked questions

How long does Cajun-Spiced Blackened Salmon with Lemon Butter Sauce take to make?

Total time is about 15 minutes (5 min prep + 10 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Cajun-Spiced Blackened Salmon with Lemon Butter Sauce?

Refrigerate in a covered airtight container for up to 3–4 days (FDA FoodKeeper guideline for cooked fish). Store any fresh salsa or citrus-based garnish in a separate container — it keeps for up to 2 days. Freeze cooked fish (without fresh garnishes) for up to 3 months; thaw overnight in the fridge and reheat gently at 275°F until just warmed through to preserve texture.

Can I substitute ingredients in Cajun-Spiced Blackened Salmon with Lemon Butter Sauce?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Cajun-Spiced Blackened Salmon with Lemon Butter Sauce for a different number of people?

The recipe is written for 2 servings. Multiply each ingredient by (your serving target / 2). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

What goes well with Cajun-Spiced Blackened Salmon with Lemon Butter Sauce?

American seafood like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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