Into a shaker place whisky, lemon juice, simple syrup, egg white and shake for 15-20 seconds.
Add ice cubes and shake for another 15-20 seconds.
Strain cocktail through a Hawthorne strainer or a slotted spoon into an old-fashioned or rocks glass filled with ice.
Garnish with 3 or 4 drops of Angostura bitters.
Serve!
Optional: serve with lemon peel and maraschino cherry
