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Soubise Sauce

Chop very fine half a medium, sound white onion; place in a saucepan with half ounce butter and gently brown on the range for five minutes. Add two teaspoons flour, mix well; add one good gill boiling milk and mix well again. Season with one-quarter teaspoon salt and one saltspoon cayenne pepper. Boil slowly for ten minutes. Add one raw egg yolk and mix well without boiling. Strain the sauce through a cheesecloth over the dish.