Saute onions and garlic in butter. Cook until onions are tender. Stir in ketchup, shrimp, salt, soup, mushrooms and pepper. Mix thoroughly. Simmer for 15 minutes. A dash of red pepper may be added. Stir in sour cream. Heat thoroughly. Do not bring to a boil. Check seasoning to taste. Serve over rice.
Cajun Country -- New Iberia, Louisiana