Carambola (or star fruit) is native to Southeast Asia. It is sweet with a hint of sour, making it perfect for a chutney. It's low in calories and high in vitamin C. It's also high in antioxidants. However, people with kidney problems should consult with their doctor before consuming star fruit, as it is high in oxalic acid. See Healthline's Star Fruit 101 for more information on this tropical fruit.