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Onion Sauce with Vinegar

Peel three good-sized onions, mince them fine, place them over the fire with a lump of butter and fry over a brisk fire until brown. Sift a tablespoonful of flour over the onions, pour in two gills of water and season with salt, pepper, mustard and vinegar to taste. Stir the sauce over the fire and boil until quite smooth. It is then ready for use.