It's an exotic, it can be found in relatively mainstream places like Whole Paycheck, and it's freaking delicious.

The salient property is that it's inedible before it's ripe, it's ripe for a day (or maybe even less), and then it gets disgusting. The end result is that the fruit is very difficult to catch when it's good, but when it's good it's very very good.

Any ideas?

Just that the taste was incredible and they're a pain in the ass because they ripen and go bad so quickly.

Not much to go on, I know. I had thought that maybe it was a mangosteen (vague memory that the name looked familiar was all), but those don't ripen once they're picked.

Which we can occasionally get at Whole Foods.