Cajun grilled salmon is a flavourful weeknight dinner that takes just 15 minutes from start to finish. The bold spice blend creates a crispy, aromatic crust while the salmon stays tender and flaky inside. It’s smoky, slightly spicy, and absolutely delicious with just a handful of store cupboard spices.
I like to try and get my kids to eat as much fish as possible, and this Cajun salmon recipe is a great way to do it. I made this just last week on the BBQ, and it was devoured in minutes.
Particularly in the summer, when I can throw this on the BBQ, the smoky charred flavours make it feel like a treat rather than “healthy fish for dinner.” The spice blend is just bold enough to be interesting without being too spicy for younger palates.
It’s become one of our summer staples since I first developed this recipe three years ago.
What makes this Cajun grilled salmon recipe so good?
The key to perfect grilled Cajun salmon is getting that gorgeous caramelised crust without overcooking the fish. The Cajun spice blend does exactly that.
It forms a flavourful barrier that helps the salmon cook evenly while adding incredible depth. You’re basically creating your own homemade Cajun seasoning, which tastes so much better than anything from the supermarket.
What makes this recipe particularly foolproof is the medium heat grilling. Too high and you’ll char the spices before the salmon cooks through. Too low and you won’t get that essential crispy exterior.
Medium heat for 5 minutes per side is the sweet spot for most salmon fillets. I’ve tested this countless times, and it works every single time.
What you’ll need
For the salmon:
- 4 salmon fillets (about 150-180g each)
- 1 tablespoon vegetable oil
For the cajun seasoning:
- 1 teaspoon garlic powder (or garlic granules)
- 1 teaspoon ground cumin
- ½ teaspoon smoked paprika
- ½ teaspoon cayenne pepper
- ½ teaspoon dried oregano
- ½ teaspoon dried thyme
- 1 teaspoon sea salt
- ½ teaspoon black pepper
To serve:
- Fresh lemon wedges
About the ingredients
Salmon fillets:
Fresh salmon works best here, but defrosted frozen salmon is absolutely fine. Look for fillets that are roughly the same thickness so they cook evenly.
You can leave the skin on or remove it. I usually keep it on as it helps the fish hold together on the grill.
Cajun spices:
This homemade spice blend is the star of the show. The combination of smoky paprika, earthy cumin, and a touch of cayenne heat creates that authentic Louisiana flavour.
If you’re sensitive to spice, reduce the cayenne to ¼ teaspoon. My kids are fine with the full amount but adjust to your family’s preferences.
Oil:
Any neutral oil works – vegetable, sunflower, or rapeseed oil. The oil helps the cajun spices stick to the salmon and prevents sticking on the grill grates.
How to make cajun grilled salmon
Step 1: Prepare the salmon
Pat the salmon fillets dry with paper towels. This is crucial – any excess moisture will prevent the spices from adhering properly and create steam instead of that lovely crispy crust.
Let the salmon sit at room temperature for about 10 minutes while you prepare the spice blend. This helps it cook more evenly.
Rub the vegetable oil evenly over all sides of each salmon fillet. Don’t skip this step – the oil acts as a binder for the spices.
Step 2: Make the cajun seasoning
Mix together all the spices in a small bowl: garlic powder, ground cumin, smoked paprika, cayenne pepper, dried oregano, dried thyme, sea salt, and black pepper. Give it a good stir to combine everything evenly.
If you’re making this ahead, you can prepare the spice blend up to a week in advance and store it in an airtight container. It’s brilliant to have on hand for quick dinners.
Step 3: Season the salmon
Generously sprinkle the Cajun seasoning over all sides of the salmon fillets. Don’t be shy with the spices – you want a good coating.
Press the spices gently into the salmon with your hands to help them stick. This ensures every bite is flavourful.
Let the seasoned salmon rest for 10 minutes. This resting time allows the salt to penetrate the fish slightly, seasoning it throughout rather than just on the surface.
Step 4: Preheat the grill
Heat your grill (or a grill pan on the hob) to medium heat. If you’re using a gas grill, aim for around 180°C.
For a charcoal grill, you want the coals to be glowing but not flaming. You should be able to hold your hand about 15cm above the grates for 5-6 seconds.
Top tip: Lightly oil the grill grates before adding the salmon to prevent sticking. Use a folded paper towel dipped in oil and tongs to wipe down the grates.
Step 5: Grill the salmon
Place the salmon fillets on the grill, skin side down if you’ve kept the skin on. Cook for 5 minutes without moving them – this is how you get those beautiful grill marks and prevent the fish from sticking.
Carefully flip the salmon using a wide spatula. Cook for another 4-5 minutes on the second side.
The exact cooking time depends on the thickness of your fillets. A 2cm thick fillet will need about 10 minutes total, while thicker pieces might need an extra minute or two.
The salmon is done when it reaches an internal temperature of 63°C (145°F) and flakes easily with a fork. It should be opaque throughout with just a hint of translucency in the very centre.
It’ll continue cooking with residual heat once you take it off the grill, so don’t overcook it.
Step 6: Rest and serve
Transfer the salmon to a serving plate and let it rest for 2-3 minutes. This brief resting time allows the juices to redistribute throughout the fish, making it even more tender.
Serve immediately with fresh lemon wedges for squeezing. The bright acidity of the lemon cuts through the richness of the salmon and complements the bold flavours beautifully.
What should I serve with Cajun grilled salmon?
This Cajun salmon pairs beautifully with so many sides. Here are my go-to options:
Light and fresh: A crisp green salad with a tangy vinaigrette balances the richness of the salmon. I particularly love mixing rocket, cucumber, and cherry tomatoes.
Carb options: Fluffy couscous, buttery new potatoes, diced potatoes or even garlic bread all work wonderfully. For something different, try serving it over creamy grits or alongside dirty rice for a proper Louisiana feast.
Vegetables: Roasted asparagus, charred corn on the cob, or sautéed green beans with garlic are all excellent choices. Basically, any vegetable that can handle a bit of char will complement the smoky salmon perfectly.
How do I store leftover Cajun salmon?
Fridge: Store leftover salmon in an airtight container in the fridge for up to 3 days. Let it cool completely before storing to prevent condensation.
Freezer: While you can freeze cooked salmon, I don’t recommend it as the texture becomes a bit dry and flaky when reheated. Fresh is always best.
Reheating: The best way to reheat grilled salmon is gently in a 160°C oven for about 10 minutes, or until just warmed through. You can also eat it cold in salads or flaked over pasta – I actually prefer it cold the next day.
Can I make variations on this Cajun salmon?
This is one of my favourite Cajun salmon recipes because it’s so versatile. Here are some variations I make regularly:
Honey butter cajun salmon: After grilling, brush the salmon with melted butter mixed with honey (2 tablespoons butter to 1 tablespoon honey) for a sweet and spicy glaze. This is my kids’ absolute favourite version.
Extra smoky: Add an extra ½ teaspoon of smoked paprika to the spice blend for deeper smokiness. Perfect if you love that BBQ flavour.
Mild version: Reduce or omit the cayenne pepper entirely if you’re cooking for children or prefer less heat. The other spices still create fantastic flavour without any heat.
Foil packet method: If you’re worried about the salmon sticking or breaking apart, wrap each fillet in foil with a bit of oil and grill in the packets. Add an extra 2-3 minutes to the cooking time.
Different proteins: This Cajun spice blend works brilliantly on chicken breasts, prawns, or firm white fish like cod or halibut. I use it on everything in summer.
FAQs for Cajun salmon
How long does cajun salmon take to grill?
Cajun salmon takes 10 minutes total to grill – 5 minutes per side on medium heat. Thicker fillets (over 2.5cm) may need an extra 1-2 minutes. The salmon is done when it reaches 63°C (145°F) internally.
How do I know when the salmon is cooked?
The salmon is done when it reaches an internal temperature of 63°C (145°F) and flakes easily when gently pressed with a fork. The flesh should be opaque throughout with just a hint of translucency in the centre.
Can I use a different type of fish?
Yes! This Cajun salmon recipe works wonderfully on any firm fish like cod, halibut, or sea bass. Adjust cooking times based on the thickness of your fillets – thicker fish need longer.
Can I make this in the oven instead?
Absolutely. For cajun salmon baked in the oven, preheat to 200°C (180°C fan/gas mark 6). Place the seasoned salmon on a baking tray lined with parchment paper and bake for 12-15 minutes until cooked through. The baked version won’t have the same char as grilled, but it’s still delicious.
How long can I marinate the salmon?
While this recipe only calls for a 10-minute rest with the spices, you can season the salmon up to 2 hours ahead and keep it covered in the fridge. This creates more of a Cajun salmon marinade effect, where the flavours penetrate deeper. Any longer than 2 hours and the salt can start to cure the fish, changing its texture.
What if I don’t have all the spices?
You can use a pre-made Cajun seasoning or Creole seasoning from the grocery store. Just use about 2 tablespoons per 4 fillets. However, homemade tastes significantly better, and you can control the heat level.
Can I use skin-on salmon?
Yes, and I actually prefer it! The skin helps the salmon hold together during grilling and gets wonderfully crispy. Always grill skin side down first for best results.
Other salmon recipes you’ll love
Air fryer teriyaki salmon
Honey soy-glazed baked salmon
Easy Cajun grilled salmon recipe
Ingredients
For the salmon
- 4 salmon fillets 150-180g each
- 1 tablespoon vegetable oil
For the Cajun seasoning
- 1 teaspoon garlic powder
- 1 teaspoon ground cumin
- ½ teaspoon smoked paprika
- ½ teaspoon cayenne pepper
- ½ teaspoon dried oregano
- ½ teaspoon dried thyme
- 1 teaspoon sea salt
- ½ teaspoon black pepper
- A squeeze of lemon for serving
Instructions
- Prepare the salmon: Pat the salmon fillets dry with paper towels. Let them sit at room temperature for 10 minutes. Rub the vegetable oil evenly over all sides of each fillet.
- Make the cajun seasoning: Mix together the garlic powder, ground cumin, smoked paprika, cayenne pepper, dried oregano, dried thyme, sea salt, and black pepper in a small bowl.
- Season the salmon: Generously sprinkle the cajun seasoning over all sides of the salmon fillets, pressing gently to help it stick. Let the seasoned salmon rest for 10 minutes.
- Preheat the grill: Heat your grill or grill pan to medium heat (around 180°C). Lightly oil the grill grates using a folded paper towel dipped in oil.
- Grill the salmon: Place the salmon fillets on the grill, skin side down if using skin-on salmon. Cook for 5 minutes without moving. Flip carefully and cook for another 4-5 minutes on the second side.
- Check for doneness: The salmon is done when it reaches an internal temperature of 63°C (145°F) and flakes easily with a fork. It should be opaque throughout with just a hint of translucency in the centre.
- Rest and serve: Transfer the salmon to a serving plate and let rest for 2-3 minutes. Serve immediately with fresh lemon wedges.
Notes
- Spice level: For a milder version, reduce the cayenne pepper to ¼ teaspoon or omit entirely.
- Make ahead: The cajun spice blend can be prepared up to a week in advance and stored in an airtight container.
- Marinating time: You can season the salmon up to 2 hours ahead and keep it covered in the fridge for deeper flavour penetration.
- Oven method: Preheat oven to 200°C (180°C fan/gas mark 6). Bake on a lined baking tray for 12-15 minutes until cooked through.
- Cooking tip: A 2cm thick fillet will need about 10 minutes total cooking time. Adjust for thicker or thinner fillets.
Nutrition
Did you make this salmon recipe?
Please let me know how this Cajun salmon recipe turned out for you? Leave a comment below and tag @cooksimplyathome on Instagram. For other recipes check out the index.