A Nearly Globular Cactus Pear
Here is a cactus fruit that is not at all pear-shaped, having rather the contour of a well rounded plum. In size and shape it is not unlike a large Standard prune; but the clusters of spicules on its surface leave no doubt as to its identity.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 6 Chapter 7