Irish Whiskey Sour with Egg White

Method

1. Add the Irish whiskey, fresh lemon juice, simple syrup, and egg white to a cocktail shaker without ice.
2. Shake vigorously for 10-15 seconds (this 'dry shake' emulsifies the egg white to build a luxurious foam).
3. Add a handful of ice cubes to the shaker and shake again for another 10 seconds until frosty cold.
4. Strain through a fine mesh strainer into a chilled coupe or rocks glass over fresh ice.
5. Dot the foam top with a few drops of Angostura bitters and express a lemon twist over the glass.