The dragon fruit is somewhere between a kiwifruit and a watermelon in texture, but with a much more subtle flavor than either. Faintly sweet with a floral aroma, they're very refreshing and one of the best ways to finish a meal or cleanse your palate between bites of rich foods. (Dragonfruit and pork belly = a great combo.) Take a look at how they grow on a farm in Vietnam.
'dragon fruit' on Serious Eats
I write with trepidation. I know if I casually toss out a claim that, “Red-fleshed dragon fruit are always sweet,” someone, somewhere, will run up and toss a bland, sickly, red-fleshed dragon fruit in my face. So I proceed cautiously: I’ve yet to stumble upon a stingy sourpuss of a red-fleshed dragon fruit. All the ones I’ve had have been glorious.