method
1. Heat 50 g (2 oz) butter until it bubbles, add the mushrooms and onion and saute until almost tender. Drain well.
2. Melt the remaining butter in a pan, stir in the flour and cook gently for 1 minute, stirring. Remove from the heat. Warm the fresh cream and stir it gradually into the pan. Stir over a gentle heat until the mixture thickens. Mix the egg yolks with the sherry and stir into the sauce
3. Stir the mushrooms and onions into the sauce with the cayenne, nutmeg and a good pinch of salt and heat through gently. Spoon on to slices of hot toast and serve immediately.
serving amount
serves 6
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