I’m in Tuscany, where the piazzas glow orange at dusk, not only from the sunsets but also from the profusion of Aperol spritz. The bright orange drink has exploded in popularity in the past five years. Everyone’s drinking it: young women, middle-aged couples, groups of wrinkly tanned men, all sucking from straws sticking out of vast wine glasses loaded with ice cubes that give the illusion that there’s more liquid than there is in the famous 3-2-1 formula: three parts prosecco (equating to just one-tenth of a bottle), two parts Aperol and one part soda water, plus the obligatory orange...