Cut meat across the grain into 1/2 inch stips, about 1 1/2 inches long. Melt butter in large skillet. Add mushrooms and onion; cook and stir until onion is tender, then remove from skillet. In same skillet, cook meat until light brown. Reserving 1/3 cup of the broth, stir in remaining broth, the catsup, garlic and salt, Cover-simmer 15 minutes. Blend reserved broth and flour; stir into meat mixture. Add mushrooms and onion. Heat to boiling, stirring constantly. Boil and stir 1 minute. Reduce heat. Stir in sour cream; heat. Serve over noodles.
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