I have been making this sweet pepper soup for over 20 years. There are two different versions that we enjoy: the recipe, as posted, with NO sour cream or tomatoes. The other version has added Dijon mustard, sour cream and a 14.5 ounce can of diced tomatoes. It is a delightfully different soup that I used as the base for my Tri-Colour Stuffed Pepper Soup. But, this soup is so good, it can stand alone, just as it is. For quantities to change out the soup, see the NOTE at the top of the directions.