Carambolas are easily damaged and it is best to choose fruits that are firm and shiny. The skin color changes from green to yellow during ripening.
Unripe green carambolas will turn yellow and ripen at room temperature and the fruit can be refrigerated for up to 3 weeks without loss of quality.
The larger sweet variety is most popular and is generally eaten fresh, either whole or sliced. The more tart type is used for making jams. To serve carambola in star-shaped slices, remove the darker edge of the cells and then slice cross sections.
China, Taiwan, India and the Philippines.