CAN YOU ID THIS FRUIT?

The wide variety of flora and fauna, here in Campeche, greatly intregs me.  There are so many types I have never seen before.  It is claimed that many have medicinal purposes, and I'm sure they do.
This one I haven't really found a satisying name for.  It is dark red and has four sections, as you can likely tell from the shape.

It is purported to be able to help with prostate ills.  If you have even a little clue do post a comment.
An inquiring mind needs to know.