I visited my local Jons at Hollywood and Vermont last night, and saw fruit I'd never seen before. They were listed as "Sour Grapes" at $1.29 per pound. They look like small champagne grapes, but are spaced further apart. They are green, and sour like a Willy Wonka candy. I ended up pairing them with some sweet fruit and a Gewertz.
Does anyone have more knowledge on these types of grapes? Their actual name? Origin? Are they just normal grapes that aren't ripe? Google searches for 'sour grapes' find information on the idiom, but not the fruit.