The English variation demands more cognac, but this is the original French recipe, which we think is loveliest: equal parts of each ingredient means a perfect balance of flavors — and a lower alcohol content. That may not sound ideal, but trust us when we say that the sidecar’s punch has a tendency to sneak up on you.
In a cocktail shaker filled partway with ice, shake ingredients until cold and well combined, about 15 seconds. Strain into chilled coupe glass. If you’re feeling extra fancy, garnish with a flamed orange twist. Some recipes call for a sugared glass, but do not give in. This is a beautiful, classic cocktail, and you don’t want to sully it with sugared nonsense.