Melissa Hamilton and Christopher Hirsheimer invented this soup as a way to use up Thanksgiving leftovers -- mashed potatoes and turkey stock -- but created this recipe to allow them to enjoy the soup all winter long. When you clear out your supply of turkey stock, chicken stock, of course, can be substituted. Light but soothing, simple and delicious, this soup, I have no doubt, will be a staple in my kitchen all winter long.

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