Changes

The organizer supplies a large crockpot for cooking; space and tools for preparing; and bowls, spoons etc. for eating.

People wash, cut up, peel, or otherwise prepare their food ingredient and add it to the pot; the organizer can determine the amount of each spice to add.

Discussions can be about the results, what is learned about the diversity of the group, the metaphors and lessons involved in the soup-making for the groups other projects (e.g., perhaps prior discussions of what each person will bring would make the result better (or, by chance the combinations "worked" - should other projects be left to chance?)

Instead of soup, the shared dish could be a casserole, a salad, a stew, pie . . .