This is a great activity for when you are introducing relative sizing or estimation to a team. It can be used to illustrate how estimations can shake out assumptions, showing the differences in what we believe is needed to complete a task, how to do so, and the risks involved. It can also be used to create your first story point scale for your own backlog.
This version does not actually require any fruit; rather, you use index cards with fruit names. As a facilitator, you act as the Product Owner in the session. The team gives relative estimates for preparing different types of fruits to build the end product: a fruit salad.