The fruit is edible. I *think* it stops growing and turns red when fully ripe, based on what little I've been able to find about it on-line. They are prone to splitting open while on the plant, which is part of why they're not common in the produce section of your local grocery store: if it's red and it splits open, I'd try eating it then and there.

The fruits don't have spines. They're red with a white interior; the seeds are distributed through the pulp, but can also be eaten. The flesh supposedly has a "mild, sweet flavor."

I would imagine that the answer to "How do you eat it?" is "Any way you can," but I realize that's not helpful.

Kem829,
they are edible, the interior of the fruit looks like dragonfruit (hylocereus undatus) white fleshed, red skin, lots of tiny seeds. I've read to chill and cut in half and scoop out the flesh. Supposed to be quite good, let us know what you think.

-Ethan