½ cup vinegar
1 onion, minced
Run blender until onion is liquefied. Add:
1 (10 ¼ ounce) can tomato soup
¾ cup sugar
1 teaspoon salt
1 teaspoon paprika
Red food coloring, optional

Start blender again and slowly add 1 cup vegetable oil. Pour in bottle and store in refrigerator.