Bon sai is an art that has been practiced in Asia for many centuries. It isn’t genetically altered to make it smaller. Bonsai trees are grown from the same seeds as trees that grow to full size. They are grown in small containers and trimmed and trained so that they remain small and elegant. In this ancient technique, you typically grow the tree outdoors where it can experience the same growing conditions as a regular tree of the same species bearing full sized fruits in a fraction of the area...
I have not seen things like this before - fruit on a bonsai....