Tomatillos are really fun to grow as tiny yellow flowers turn into magical hanging green lanterns which eventually burst open revealing the green shiny fruits inside. They can be used for relishes, or fried with a crispy polenta coating. They are one of the main ingredients in Salsa Verde and have a sharp taste a bit like a green plum, but very refreshing.
These do well in a polytunnel and grow about 3ft tall and spread 3-4ft wide, so give them plenty of space.