Vermouth is hitting its stride--again. The cocktail resurgence has put a spotlight on an often-overlooked ingredient in some of the most iconic cocktails of our time: vermouth. It appeared in America in the 1860s, reigned supreme in drinks like the Manhattan and the Martini, then fell out of favor during the counterculture days of the 1960s. But with artisanal cocktails now the rage, interest in vermouth is at a peak. After all, without it, your martini...