Belimbing. A relative of the carambola native to South East Asia, this is a light green, acidic fruit with a smooth yellow-green or slightly rough green skin and juicy, sour flesh. It is added to soups and stews or curries, to which it gives a sour flavour, or made into sweet and savoury preserves, chutneys and pickles. It is sometimes known as the cucumber tree because of the shape of its fruit.