Barbecue Kielbasa
["1 medium onion, thinly sliced", "1 Tbsp. butter or margarine", "1 lb. fully cooked kielbasa or Polish sausage, cut into 1/4-inch slices", "1 c. ketchup", "1/3 to 1/2 c. packed brown sugar", "2 Tbsp. Worcestershire sauce"]
["In large skillet, saute onion in butter until tender. Stir in remaining ingredients. Bring to boil. Reduce heat; simmer, uncovered, for 3 minutes or until sauce is slightly thickened, stirring occasionally. Yields 4 servings."]
["onion", "butter", "fully cooked kielbasa", "ketchup", "brown sugar", "Worcestershire sauce"]