I hope I am wrong, but I suspect it needs a cooler summer and warmer winter than we can provide...also, a stream-side location. I hope someone proves it can grow here. I would love to try it too.

I've never tasted one myself, but have seen several trees and fruit. Supposedly it has a lemonish mixed with grapefruit taste. It is a cross between a pomelo and an ichang papeda. So it's a sibling to the Yuzu, Kabosu and Sudachi, which is are mandarin and ichang papeda crosses.

I used to collect all sorts of Solanum family edible plants and I grew a great form of Cocona. I like them because they handle full sun better than most of the rest of the clan. I found that if I start the seeds very early indoors and get them out in early May I could get a crop before first frost. The fruit has an odd and not so special flavor raw but when cooked with a splash of lemon juice and some sugar it takes on all sorts of tropical fruity flavors. It didn't seem to matter how much sugar either. If you put a lot of sugar it would cook down to a decent jam without needing to add any pectin. A jam that tasted like tangerine mixed with mango. Because they will cross with other relatives that I grow I tend to focus on them every other year in order to keep my seed lines pure. I don't have any in the garden this year. Keep in mind that this type of tropical eggplant is very variable. There are some that look like small bell peppers and some that are pingpong ball round, some are reddish orange and others that are bright yellow. I've seen them be meaty and thick walled and juicy and thin skinned. In some parts of South America they treat them as a fruit and in others they treat them like a vegetable. Everybody cooks them, they don't have enough flavor when raw. They can catch any disease or pest that affects eggplants/tomatoes/peppers/potatoes. They can also be bug magnets in the winter when you store them indoors or in a greenhouse. When I visited Colombia they were in season and the locals like to cross breed them with the related 'Lulo' to get a better flavored juice. I'm growing Lulo this year but they hate high heat so they are not happy this summer. Here are some photos from the last Cocona crop.

Nope. I see some berries. Could they be some kind of Vaccinium?