Dragon fruit. Why would they called a fruit, dragon? If you had seen the plant, you would understand why. It really does looks like a wild dragon, with lots of messy overflowing branches, similar to the dragon wings, scales or hairs. The fruit itself does look like one too. This fruit originated from Mexico to northern South America.
The red dragon is here! It is one of the three main species of dragon fruit. The other two is the white flesh and the uncommon, yellow skin/white flesh. There are various cultivars of dragon fruit and since they do look alike to a layman, I will just put them under their colour classifications.
This is a beautiful fruit and pretty attractive to look at, especially the maroon flesh. Just cut the fruit into half and scoop it with a spoon. Taste is only mildly sweet, quite similar to eating green kiwifruit. The numerous small, black seeds are edible and crunchy, so don't bother spitting it out.
If you prefer, you can drink it as a juice but it is slightly thick, similar to papaya juice. Juice it into a clear glass and it will looks like a glass of "sweet Bloody Mary with numerous black heads".