When Gaspare Campari first mixed together equal parts sweet Italian vermouth from Turin and his namesake bitter from Milan even he couldn’t have imagined the unbreakable cocktail foundation he was laying. He began serving the combination at Caffè Campari in the 1860s and dubbed it the Milano-Torino, later known as the Mi-To. The concoction balanced sweet, herbal, savory, and bitter into one…