Sauce à la D'Orléans.—Bring to the boil two tablespoonfuls of the best Orleans vinegar, then add to it a full tablespoonful of rich espagnole sauce, and let this heat; now work into it bit by bit 1½oz. to 2oz. of fresh butter, being careful not to add the next piece till the first is perfectly dissolved; then stir into it a dust of cayenne and of caster sugar, with a good pinch of finely minced parsley, and serve.