pitaya

Halleys Comet is a hybrid of a white fleshed and red fleshed fruit. It is incredibly large, typically weighing 1.5-2.0 lbs. The fruit is slightly more rounded than the Physical Graffiti, and the fins are more abbreviated. In all other respects they are nearly identical.
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What to do with a Dragon fruit?

Eureka Red Dragon Fruit is a large self pollinating red flesh fruit, originally from Nicaragua. It is most similar to Natural Mystic

Red Pitaya with white flesh. David Bowie is a slender white variety that has a sweet and tangy flavor that is somewhat lemony. The fruit are medium to large weighing up to a pound. This variety is best eaten fresh, but it would be good for juicing or garnishing as well. It is variety is self pollinating.
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What to do with a Dragon fruit?

Very rare Yellow Pitaya. This cactus originates from Bolivia, Equador, Peru and Columbia. It's greatly known for it's sweet tasting fruit. Knobbed, yellow cactus fruit sharing some similarities with the Hylocereus dragon fruit (pitaya). Taste is said to be superior to most cactus fruits. The fruits are smaller than the common dragon fruit, and contain prominent spikes until ripening time, upon which the spikes drop off.
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Pitaya page
What to do with a Dragon fruit?