
Mackerel is one of those fish that rewards bold seasoning, and a blend of turmeric, smoked paprika, and black pepper gives these fillets a gorgeous, warmly spiced crust that smells incredible the moment it hits the hot oven. A high roasting temperature means the flesh turns perfectly flaky and opaque in under twenty minutes, while thin lemon rounds and sliced garlic caramelize gently around the fish, adding brightness and a little sweetness. Finishing with a generous scatter of fresh parsley, dill, and thyme right out of the oven keeps the herbs vibrant and fragrant rather than wilted. Good-quality extra-virgin olive oil ties everything together, keeping the fillets moist and carrying all those spices deep into the flesh. This is the kind of weeknight dinner that looks and tastes far more impressive than the effort involved — a single baking sheet, a handful of pantry spices, and you're done. Serve with extra lemon wedges and maybe some crusty bread to soak up the herby, garlicky pan juices.
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Preheat the oven to 425°F (220°C). Line a rimmed baking sheet with parchment paper and drizzle 1 tbsp of the olive oil evenly over the surface.
In a small bowl, stir together the turmeric, smoked paprika, black pepper, and salt. Pat the mackerel fillets dry with paper towels, then rub both sides of each fillet with the spice mixture.
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