The late Mary Holbrook, a white-haired maestro in the British cheesemaking world, was known for her soft cheeses and her sharp temper. Once a week, she made the trip from Sleight Farm, her home in the southwest of England, to London to check on her wares as they ripened in the maturation rooms of an upscale cheese shop. Holbrook’s apprentices, hardened to her singular style of mentorship, knew to brace themselves for reprimands when she returned. Occasionally, though, Holbrook would come back