There are lots of versions of the story of Stone Soup. In each one a traveler comes to a village where no one is willing to share because they don’t have enough. The stranger starts to boil a pot of water and puts a stone (or other inedible object) in the pot. He or she tells each villager who comes by that they are making stone soup but it would be ever so much better with just a little bit of carrots/onions/herbs/etc. Each villager is convinced to contribute the “one thing” the soup is missing. In the end the stranger has a big pot of soup to share with the village.
A Guider I used to work with used this story to make a pot of collaborative soup each year. She’d read the story to the girls one week and tell them that at their next meeting (or sometimes it would be at winter camp) she’d be providing the soup pot and a clean stone. She’d ask each girl to bring something for the soup (vegetables, bullion, herbs etc. ). Whatever arrived at the next meeting was chopped up and put in the soup pot. Everyone would enjoy a mug of soup at the end of the meeting. Be aware of allergies or other dietary restrictions.