Ingredients are simmered gently in a copper pot. A good thermal conductor, copper spreads heat evenly and prevents "hot spots" that might scorch the candy. The Fudge House at Fisherman’s Wharf in San Francisco, California, makes its signature product in relatively small batches. The cooking process—freely observable in the small shop—is not all that different from fudgemaking at home. At least once during the cooking process, the cook brushes water down the inside walls of the cooking pot to dissolve any crystals that have formed which might cause the candy to crystallize prematurely. - Candy Home Page - ©Exploratorium