
The colors are between vivid and fluorescent, and the first time I saw one I thought it looked like something out of a video game like WoW. Even the name: "dragonfruit". And the plant itself looks a bit alien:

Anyhow - eating one is easy. Slice it open and scoop out the insides with a spoon. Some are a bright red on the inside, some white. Otherwise, pretty much the same thing. The flavor is mild, the texture like kiwis or melons or the like.
Basically, this is a cactus fruit.
Although all the ones I've seen for commercial sale around here are from south east Asia, mostly Thailand, the plant is actually native to the deserts of North America on the southern border of the US/Mexico.
These days there's all sort of hype about how AMAZING and HEALTHY these things are and how they will cure what ails you, but really, it's just another type of fruit. Buy it ripe and healthy it's good for you. Process it heavily... not so much.
Anyhow - I like to have one from time to time and my ulterior motive here is that if they become more popular they might become easier to find in stores and/or cheaper to buy.
