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Robert Sauce

Chop a peeled onion into one-fourth inch dice, and fry these in one tablespoonful of butter until browned; then add a teacupful of vinegar, and boil swiftly until the liquid has nearly evaporated. Then stir in one and one-half breakfast cupfuls of any cold brown gravy, or stir in first one tablespoonful of dry flour, and let it brown, and then mix in one and one-half breakfast cupfuls of boiling water. Season the sauce highly with pepper and salt, and simmer it slowly for fifteen minutes. Just prior to using it, stir in one dessertspoonful of mustard.