Prep Glass: Fill your Old Fashioned glass with ice cubes. Give it a stir to chill it and set it aside
Add Egg White: Crack open 1 egg, separate white from yolk and pour the white into the shaker.
Add Bitters: Add 1 dash of Angostura Bitters to the shaker.
Add Simple Syrup: Add ¾ oz simple syrup to the mix.
Add Lemon Juice: Measure and pour 1 oz lemon juice into the shaker.
Add Aguardiente: Pour 2 oz Aguardiente into the shaker.
Dry shake: Seal your shaker and shake for about 15 seconds.
Add Ice: Fill your shaker with ice cubes
Shake Well: Shake the mixture well until chilled.
Strain and Serve: Strain the mixture into the Old Fashioned glass over fresh ice.
Garnish: Place a lemon slice or twist into the glass for garnish.