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Rub the oil and garlic paste over the fish with 2 tbsp of the lime juice. Season, then marinate for 20-30 mins.
Heat oven to 190C/170C fan/gas 5. Whizz together the crust ingredients and the remaining lime juice to make a rough paste. Pat the fish fillets dry with some kitchen paper, then press a quarter of the crust onto each fillet. Lift onto an oiled baking tray, then roast for 12-15 mins until cooked through.