Melothria scabra. Also known as the Mexican Sour Gherkin, cucamelon seeds produce vines that could be mistaken for regular cucumber plants. The plants are not quite as productive as cucumbers, but the fruits are amazingly cute and novel. 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.