1. Preheat the oven to 200°C/400°F/Gas 6 and butter an ovenproof dish, scatter the mushrooms in the bottom, add the fish and season with salt and pepper, to taste; pour the boiling milk over the top, cover and cook in the oven for 20 minutes. 2. While the mushrooms and fish are cooking, cover the potatoes with cold water; add a good pinch of salt and boil for 20 minutes; drain and mash with the butter and milk, and season to taste. 3. Using a slotted spoon, transfer the fish and mushrooms to a 1.5 litre (11/2 quart American; 1.5 litre Canadian) baking dish. Pour the poaching liquid into a jug and set aside. 4. To make the sauce: Melt the butter in a saucepan, add the onion and celery and sauté until soft but not browned; stir in the flour, then remove the pan from the heat; slowly add the reserved liquid to the pan, stirring until it has been absorbed; then return the pan to the heat, stir and simmer to until the sauce thickens; add the lemon juice and parsley, season to taste, then add the sauce to the baking dish, using the sauce to cover the fish and the mushrooms. 5. Top with the mashed potato and place the baking dish in the oven for 30-40 minutes until the potatoes are golden brown. ---------------------------------------------------------------------------
Nutrition
Ingredients
