What, in your opinion, the most obscure and under-appreciated fruit?

[BloomAndSprout]

Having gotten into this hobby and not realizing just what I was getting into from the start, I've become obsessed with collecting obscure fruiting plants that have some merit or other--aesthetics, taste of fruit, both... and through the various collectors here I've discovered (and obtained the seeds for) many interesting plants that "nobody" has heard of...

We all know mangos, jaboticabas, eugenias, miracle berries, and now even yangmei... what fruiting plant do you think deserves more attention that even many hobbyists may not have heard of?

[Alippincott]

Hovenia dulcis aka Japanese Raisin Tree.

I started growing mine from a seedling last year and now it is a giant. It produces very weird 'stick' fruit things that are quite tasty. Apparently its wood is great for woodworking, so if I end up not liking it, at least I can turn it into a chair.

[mcoambassador]

Duguetia
Ilama
Abiu
Also some of the more obscure species of eugenia and passiflora.

[Tropical Sunshine]

Mocambo
Cupuassu
Chinese passion fruit melon
Capulin cherry
Cecropia peltata aka gummy worm fruit

[Bush2Beach]

Chempadek and Pulasan. Both highly edible with addictive qualities.

I see some fruits listed I consider barely edible and have removed.
Taste buds differ quite a bit.