My kids had a book about a wolf who made soup with a stone, "Une soupe aux caillou". The wolf travels to other animals' homes; the animals are afraid at first,

My kids had a book about a wolf who made soup with a stone, "Une soupe aux caillou". The wolf travels to other animals' homes; the animals are afraid at first, but they let him in because he says he only wants to make soup. He comes in, boils water in a big pot, puts his stone in. The animals want to help with the soup, and so they suggest other ingredients. The wolf says "well, sure, you can add that if you want". They drink the soup together. Then the wolf gets up, takes his stone back from the pot, and leaves. The process repeats for 8 or 10 different animals, and that's it. It's a fantastic book. We must have read it hundreds of times.