#1 Un ripe grapes ghooreh
I never had them from the store,
but before I even knew about them I tried them when the city cut my neighbors concord or niagra vines down.
After dried the have a green apple flavor more
(makes since since it would have more sharp malic acid in green (Granny smith) apples)
and not tartaric acid like ripe ones)
these were not far along after forming
so I would think if you wanted to thin wine grapes to have a better quality wine
you could let some develop for a few weeks before thinning to use for a snack.
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#2 I hear when unripe the flavorless Indian straw berry has flavor it loses it's flavor (acids) when ripe)
(Genus Duchesnea indica Not strawberry genera)
#3 unripe (red) mulberry just barely unripe, and freeze dried for more acid profile.
#4 what about unripe mango seed (butter) Gulti
Random link gulti
https://www.ndtv.com/food/mango-kernels-or-gutli-benefits-you-must-know-it-s-more-than-just-a-seed-1842506Random link Persian cooking green sour grape Ghooreh
http://www.mypersiankitchen.com/ghooreh-unripe-grape/I know when On a far bike ride I wanted bitter tea
so chewed up some mature mango seed
put it into a mess kit boiled water , and made some tea,
but never tried Gulti , or store bought powdered mango seed to compare,.
(or even knew it existed at the time)
I think another question to ask is what fruits can be unripe,
and what fruits will ripen after being picked unripe?
I stored a green tomato (beef steak) for 2 or 3 months on a window sill, and it turned red
Also some persimmons that were hard as a rock
stored in fridge in ziplock bag for around 3 months, and they ripened sweet
(others did fall from the tree ripe when I picked these though so decided to experiment ,
but these were in arms reach, and didn't have a rope with me to shake any down)
Would tamarind be Okay picked early
If you have unripe mangos I hope they are not stored in a plastic bag
Store bought things picked early like apples never taste as good,
but I think it is better taking them out of the plastic bag it builds up ethylene
at least with grapes I've had them raisin up in fridge out of a plastic bag but spoil in the plastic
actually had pawpaws (for the seeds) raisin in the fridge that were ripe but in a box with newspaper.