The Old Flame comes to us from The PDT Cocktail Book, and it’s a great drink to whip out when you want to impress your guests with a bit of showmanship. We’re not really sure of the function of setting Green Chartreuse alight, but it does seem to introduce a light caramelization of the liqueur’s sugars, and the brief touch of warmth on an ice-cold drink is novel and delightful.