"It's hard to come up with a more nutritious soup recipe than this fat-free kale and sweet potato soup. No butter or oil is needed when you're using the delicious combination of satisfying sweet potatoes and flavorful kale. Not only is this fat-free soup nutritious and tasty, it's incredibly easy and fast to prepare. Both the main ingredients are on many of the "super foods" lists and this kale and sweet potato soup is a great way to enjoy them...."