They look like miniature watermelons and taste like sour little cucumbers. We started growing these about 3 years ago as a novelty that adds a little pizazz to our salads. The sour little fruits get about 1-2" long and the vines readily climb any trellis provided. I have not tried it but they are supposed to be excellent pickled and will store fresh for a surprisingly long time.
The vines alone are a very lovely addition to the garden