a woman bites into a slice of extremely unripe green apple from a sample tray. Her face immediately contorts with a sharp, puckered expression as the acidic taste hits her tongue. Her eyes squeeze shut and her mouth twists into a sour grimace. The vendor behind the stand watches with an apologetic expression while other customers nearby notice her intense reaction. A small child next to her backs away slightly from seeing the woman's dramatically sour facial expression. the sharp, bitter taste experience that defines something acidulous