The rambutan is one of the most popular fruits in south-east Asia. The spiky red skin contains an edible, translucent fruit with a sweet-tart flavour. The rambutan is also known as the hairy lychee: it looks very similar to a lychee on the inside but the outside is completely different. The rambutan grows in clusters of 5-20 fruits on trees that can reach as much as 25 m in height. The tree can bear fruit twice a year.