Chayote (Sechium edule), also known as:
custard marrow, christophene (France, Caribbean), chouchoute (Madagascar, Polynesia), brione (France, West Indies), vegetable pear, cho-cho, soussous, chuchu, choko, pipinella, xuxu, mirliton (southern U.S.), mango squash, and huisquil.
For all these exotic names, this is simply a subtropical member of the squash family, eaten as a vegetable. It is a pear shaped fruit, has a single seed and a taste similar to zucchini. The young root tubers are also eaten.
Chayote is native to Mexico and Central America and was a popular vegetable with the Mayas and Aztecs. It's cultivation has spread all over the world, including Algeria, Madagascar, Polynesia, southern U.S., China, Indonesia, New Zealand and Australia.