Technically called a pitaya or pitahaya, this cactus -- yes, cactus! From the outside the fruit looks like a hot pink bulb ringed with a jester's crown of curly greenish petals. Slice it open, and there's a white (or, on rare occasions, fuchsia) scoop of sweet pulp speckled with tiny black seeds.
Its taste, however, is much less flashy, which is why dragon fruit is often added to dishes (or drinks) with "soft" flavors, like strawberry or even rose petal. It's rich in fiber and antioxidants.