Longan is a tropical fruit (lat. Dimocarpus longan), a part of the soapberry family, which also includes lychee and rambutan.
Longans are small, round, and have a thin, brown shell that is easy to remove. Inside, they have translucent white flesh that is sweet and juicy, with a texture similar to that of a grape but slightly firmer. At the center of the fruit is a large, black seed, which gives it the nickname "dragon's eye" — which is what "longan" means in Chinese.