Hmm.... sounds like a rose hip. A rose hip is about the size of the persimmons in that picture. The flesh/ meat is only about 1/8 - 1/4" thick, and the center is filled with seeds that have a prickly feel to them.
An unripe rose hip will certainly give your taste buds a jolt!
According to dictionary.com, a persimmon is "the usually orange several-seeded globular berry of a persimmon that is edible when fully ripe but usually extremely astringent when unripe "
Must be an aquired taste
