Two halved yellow dragon fruit in the palm of a hand
Hylocereus megalanthus (Yellow Dragon Fruit)

One of three native Colombian species of the genus Hylocereus with a habitat between 300 and 6,000 feet. The sweet fruit is called pitaya in Colombia and is relatively expensive. It is available in the supermarkets and is also exported. It is sweet enough to be eaten fresh or can be made into a tasty juice.