Master mixologist gaz regan dug up this gem from Ted Saucier’s 1951 recipe book Bottoms Up. Like most drinks containing egg white (or aquafaba, a vegan alternative), you should “dry shake” – that is, shake the ingredients without ice – for a good 15-30 seconds before adding ice and shaking again. Egg white is difficult to incorporate, so the extra dry-shaking time gives it a chance to properly emulsify.