On the asphalt outside Berkeley’s A Donkey and Goat winery, 35-year-old owner Jared Brandt is scooping grapes out of a 500-liter wooden barrel. His wife, Tracey, is moving more barrels around with a forklift, and several friends are helping out. Today they’re pressing their 2006 syrah, an elegant, medium-bodied wine made with grapes trucked in from Broken Leg Vineyard, a remote plot located in Anderson Valley, 100 miles northwest of San Francisco....