Is egg white in a cocktail safe, and is it required?

The answer

No, egg white is optional. It adds a silky texture and a foamy top to drinks like the whiskey sour, clover club and pisco sour, but the drink is still enjoyable without it, and many bars will leave it out on request. If you choose to use it, start with fresh eggs, wash the shell and use clean tools. People who are pregnant, have weakened immune systems or have an egg allergy may wish to avoid it, and should always tell the bartender about any allergy.