Add all ingredients to a cocktail shaker without ice and "dry shake." (Shake without ice first.)
Add ice to shaker, and shake the ingredients with ice for 10-15 seconds.
Double strain with a Hawthorne cocktail strainer and fine strainer into a pre-chilled coupe glass (or Nick & Nora).
Garnish by dropping a few drops of bitters into the egg white foam and dragging a toothpick through the drops.