Mangoustan is a tropical fruit from Southeast Asia. It is a summer season fruit, which is generally available from June to September. The mangoustan has a round or oval shape, and a rough and thick skin, which varies from green to dark red. Its flesh is white, juicy and sweet, and it surrounds a hard and bitter core. Mangoustan has a soft and tangy flavor, which recalls that of mango and orange. Mangoustan is an excellent source of vitamin C and dietary fiber, and is also rich in antioxidants. It is often used in smoothies, fruit salads and desserts.