2) Heat a large cast iron frying pan or saute pan over a very high heat and carefully add oil to pan. When the oil begins to slightly smoke, add the catfish fillets and cook on each side, about 2 to 3 minutes. Cook in batches, if necessary>
3) Pre-heat the oven to 110C/Gas 1/4. Transfer the fillets to the oven to keep warm as they are cooked. To serve, top each fillet with 10g of butter and serve with lemon wedges.