I find that they taste like a mix of pear and mild kiwi.
I have a dragon fruit plant at home. Pretty.
That might be why I couldn't really pintpoint it - I don't eat both often, I think over ten years since I ate a pear, and five for Kiwis. (They hurt my tongue ;_; ). But yeah, now that you say it, there's resemblance!
Oh, gotta google how the plants look. I do think the fruits are among some of the prettiest!
Edit: They look AWESOME!