method
1. Melt the butter in a pan, stir in the flour and cook gently for 1 minute, stirring. Remove pan from the heat and gradually stir in the milk. Bring to the boil and continue to cook, stirring, until the sauce thickens, then add seasoning to taste.
2. Combine the onions, potatoes, mushrooms and celery with the sauce and turn into 1.1 litre (2 pint) ovenproof casserole. Pour over the fresh cream and bake in the oven at 180°C (350°F) mark 4 for about 1 1/4 hours then remove pie from oven. Scatter top with grated cheese and return dish to oven for about 15 minutes until the vegetables are cooked.
serving amount
serves 6
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