pistachio fruit The pistachio fruit: the reddish, wrinkled fruits are borne in heavy clusters somewhat like grapes. Although known as a nut, the fruit of the pistachio is botanically a drupe, the edible portion of which is the seed. The oblong kernel is about 1 inch in length and 1/2 inch in diameter and protected by a thin, ivory-colored, bony shell Normally the shells split longitudinally along their sutures when...