Or cucamelons, or Mexican sour gherkins, or
Melothria scabra (http://en.m.wikipedia.org/wiki/Melothria_scabra): cute, tasty, perfect snack size for the kidlets,really do pretty much taste like an ever so slightly sour cucumber, wish they were a bit more prolific but more plants next time. However, under no circumstances should you eat one which has fallen, overripe, from the vine: it will taste like arse.