Cut steak into thin strips. In a large skillet (oven-proof, if desired), brown meat in oil, using high heat. Add onions. Saute until tender crisp. Blend soup, sherry, liquid from mushrooms, and garlic salt. Pour over steak. Add mushrooms. Reduce heat, cover and simmer for 1 hour or until steak is tender. (Or cover and bake at 350) Serve over beds of fluffy rice.
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