Spaniards line up at weddings, tennis tournaments and galas to eat ham prepared by Ernesto Soriano, one of the world’s best slicers of jamón ibérico. At the Madrid Open tennis tournament last month, Ernesto Soriano, a bald veteran with a wild gray beard, a tattooed torso and a belly protruding under his match-day whites, mesmerized salivating fans with precise forehand slices. “These tennis player... [917 chars]