Depression Casserole
["1 large onion, chopped", "1 to 2 Tbsp. cooking oil", "1/2 c. ketchup", "1/2 c. water", "1/4 c. vinegar", "1 tsp. dry mustard", "1/4 tsp. pepper", "1 pkg. (16 oz.) frankfurters, cut into 1-inch chunks"]
["In a saucepan, saute onion in oil until tender.", "Stir in ketchup, water, vinegar, mustard and pepper.", "Bring to a boil, stirring occasionally.", "Place frankfurters in a 1-quart baking dish.", "Pour sauce over it.", "Bake, uncovered, at 375\u00b0 for 30 minutes or until bubbly.", "Serve over toast or rice."]
["onion", "cooking oil", "ketchup", "water", "vinegar", "dry mustard", "pepper", "frankfurters"]