" During Prohibition, enterprising California grape growers kept themselves in business by selling “fruit bricks”—blocks of dried, compressed grapes that were packaged with wine-making yeast. A label warned purchasers not to dissolve the fruit brick in warm water and add the yeast packet, as this would result in fermentation and the creation of alcohol, which was illegal. "

― Amy Stewart , The Drunken Botanist: The Plants That Create the World's Great Drinks