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Mornay Sauce
Heat in a saucepan one and a half tablespoons melted butter, add two tablespoons sifted flour, stir well, then add one and a half gills hot milk; season with half teaspoon salt, two saltspoons cayenne pepper and a saltspoon grated nutmeg; sharply whisk for two minutes, add one ounce grated Parmesan cheese and whisk for two minutes. Add one egg yolk, briskly mix while cooking for two minutes, without allowing to boil, and use as required.