This treat is usually reserved for children (mince alors!), who invite their friends around to share it. According to custom, one child crouches under the table while the cake is being cut and calls out the name of the person to whom he wants the slice to be given. Because, you see, this is no ordinary cake. Somebody who obviously didn't like children came up with the idea of concealing a hard, dry bean (la fève) and a tiny porcelain figurine inside. The children who find these in their slices are crowned King and Queen for the day with the golden paper crown provided, which is meagre compensation if they've just broken their teeth on the china ornament or, worse, swallowed it...
You have been warned...