My dad told me this story when I was a child. Its better told as a story about a hungry man who tricks passers by into putting ingredients into his stone soup so he has a meal. Maybe incorporate it into an interactive story/cooking activity.
what makes a classroom family? Can go along with lesson for 'Pumpkin Soup' during the fall. "Ingredients for a loyal friend" or "ingredients for a cooperative classroom". Vocabulary for lesson: loyal, cooperate