A bread bible for the home baker or professional bread-maker: It comes from Chad Robertson, a man many consider to be the best bread baker in the United States, and co-owner with Elizabeth Prueitt of San Francisco's Tartine Bakery. At 5 P.M., Chad Robertson's rugged, magnificent Tartine loaves are drawn from the oven. The bread at San Francisco's legendary Tartine Bakery sells out within an hour almost every day.