About 4 years ago I obtained a half-dozen Naranjilla (
 Solanum quitoense) plants from a local nursery. Apparently customers weren't interested. This is a beautiful, exotic plant which grows well outdoors here in San Diego CA, USDA zone 10a. The plant produces flowers here almost constantly, and last year a few of them set fruit. Now my location is not tropical Ecuador, so I wasn't surprised that the ripening period was about 9 months! The flavor is definitely worth the wait. The best source of information about the plant I have come across is in Julia Morton's classic text, excerpted here: 
Naranjilla.
Here's a photo of a portion of my plant, along with a snapshot of my emerging seedlings 
 
 
