Shaking cocktails is primarily done to mix ingredients thoroughly while also aerating the drink, which enhances its texture and flavor. Cocktails that benefit from aeration are typically those that contain juices, cream, or other mixers that require vigorous shaking to combine effectively. The shaking process introduces air into the mixture, creating a light, refreshing quality that is desirable in many cocktails.
For instance, drinks like the Whiskey Sour or the Margarita, which contain citrus juice and often egg white or other mixers, are ideally shaken. This method not only chills the drink rapidly but also helps to emulsify the ingredients, resulting in a smoother and creamier final product. Thus, cocktails that are shaken are chosen specifically for their need for this aeration process to enhance the overall drinking experience.