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Heat oven to 200C/fan 180C/gas 6. Rinse the fish, then pat dry with kitchen paper. Put in a roasting tray, season, then dot with a third of the butter. Roast for 10-12 mins.
When the fish is almost ready, melt the remaining butter in a frying pan. Turn up the heat until it turns brown. Take off the heat, then add lemon juice, parsley and capers. Pour over the fish, then serve with green beans.