Headquartered in San Francisco, Boudin Bakery is world-famous for The Original San Francisco Sourdoughâ¢, which is baked with the same Mother Dough, or sourdough starter, used since 1849. Born in the Gold Rush, Boudin is the oldest continuously operating business in San Francisco. Because each loaf is made from a portion of the original sourdough starter, Boudin Sourdough is one of a kind....