Ok so perhaps that is not the most scientific of explanations-- according to Wiki, the dragon fruit is a fruit from a cactus like plant, grown in tropical South-East Asian countries. After a quick tutorial on how to eat it (cut in half and scoop out the flesh with a spoon), we were ready to eat!
The crunchy black seeds gave the fleshy fruit a texture akin to the texture of kiwi, but the taste was different-- sweeter and plainer -- and delicious! It was expensive.. but definitely worth a try! I am willing to splurge on this fruit again. And until the day I can try it amidst its natural environs, I will have to be content with the glories of the Korean market.