We first read about this recipe in Gaz Regan’s The Joy of Cocktails, but it originally came from Ted “Dr. Cocktail” Haigh. Dr. Cocktail always shakes his drinks (“You know me, I’m a savage,” he tells Gaz), but if you don’t like it with bubbles on top, stir instead.
Shake or stir with ice and strain into a chilled cocktail glass. Garnish with a lemon twist.