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Pork Tenderloin Lyonnaise

Wipe and split two large pork tenderloins in halves lengthwise; sprinkle with salt, pepper and dredge with flour. Melt two tablespoons each of Cottolene and butter in an iron frying pan, and brown tenderloin richly on both sides in the hot fat. Remove to wellgreased dripping pan and add to fat three onions thinly sliced; cook until delicately browned, stirring often. Sprinkle over onions two tablespoons flour, stir well. Put two tablespoons vinegar into onehalf cup hot water, add slowly to onions, mix thoroughly. Lay tenderloins over onions, cover closely and cook in the oven until meat is tender. Dispose tenderloin on hot serving platter and pour over contents of frying pan. Vinegar may be omitted and more water added.