Melothria scabra. Also known as the Mouse melon. They look like tiny watermelons, but have a very appealing cucumber flavour with slight citrus notes. Eat them fresh or pickle them for a crunchy treat. Harvest them at the 2cm (1") size, before the seeds develop. This is a heat loving tropical plant that is most productive in hot weather or a greenhouse setting. Start the seeds indoors and treat as you would a conventional cucumber seedling.