Love potions, cures for toothache or flatulence, tasty flavoring - spices have been a pungent presence down the ages. Long before Peter Piper picked his peck of pickled pepper, the Queen of Sheba sent spices to King Solomon and Emperor Nero burned Rome's annual supply of cinnamon at his wife's funeral. It's hard to imagine how these berries, seeds and barks once unleashed ferocious passion in European adventurers who fought tooth and claw to control...