Mackerel Fillets with Dill-Caper Crust
Fatty mackerel fillets baked with a herbaceous dill-caper crust, delivering rich omega-3s in a 12-minute weeknight dinner. This Nordic-inspired seafood recipe (keto, high protein), ready in about 27 minutes, pairs mackerel fillets, olive oil, sour cream for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 360 calories and feeds 2, so it slots cleanly into a low-carb week and pairs well with cauliflower rice or roasted green vegetables. 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.
Ingredients
- 2 (6 oz each, 170g each) mackerel fillets
- 2 tbsp olive oil
- 1/2 cup (120g), full-fat sour cream
- 2 tbsp, drained and chopped capers
- 1 tbsp, chopped fresh dill
- 1/2 tsp lemon zest
- 1/4 tsp salt
- 1/4 tsp black pepper
The sheet pan we’d roast this on → Best Sheet Pans in 2026: Top Picks + Buying Guide
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Equipment for this recipe
Tools this recipe's steps call for, with a link to each on Amazon.
Instructions
- Step 1: Preheat oven to 400°F (200°C). Place mackerel fillets on a baking sheet, brush with 2 tbsp olive oil, and season with 1/4 tsp salt and 1/4 tsp black pepper.
- Step 2: In a small bowl, mix 1/2 cup sour cream, 2 tbsp chopped capers, 1 tbsp chopped fresh dill, and 1/2 tsp lemon zest until smooth.
- Step 3: Spread the sour cream mixture evenly over the mackerel fillets.
- Step 4: Bake for 12-15 minutes until the mackerel is cooked through and the topping is lightly golden.
- Step 5: Serve immediately with extra dill for garnish.









