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Wash and trim mushrooms, but do not peel.
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Chop the stalks and slice the caps, cook the stalks slowly for 10 minutes in a covered pan, in 1 oz of butter, add the caps, add the seasoning and a pinch of nutmeg.
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Cook for 5 minutes uncovered.
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Melt the remaining 1 oz of butter, work in the flour, add milk and cook until thick, stirring briskly. Add the mushrooms and simmer for 5 minutes.
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Remove from the heat, and beat in two-thirds of the cheese.
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Correct the seasoning, put a tablespoon of filling centrally on each pancake, roll up and place in a buttered ovenproof dish.
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Cover with remaining sauce, sprinkle with remaining cheese, reheat and brown under a hot grill.