In response to the comments on my previous post, I did a little Google research and found out that dragon fruit isn't just a kids shampoo scent that I don't care for (side note: did you know you can buy shampoo on Amazon? What?!) .
It is a prickly, purple-rinded, gray-fleshed fruit. It's pretty good, very mild, not particularly sweet. Apparently some Whole Food stores have it for around $12 a pound. Here's a pretty professional image, much better than the one my cell phone took. Here, the flesh is less gray and the rind is more pink than purple, but the one I ate looked just as it does in my picture.