Inspired by a love a seasonal pumpkin pies, Pumpkin Spiced Cold Brew, and egg white sours. I spent most of the late summer tinkering with what would be a pumpkin pie spice syrup and was very pleased with the result.
Seperate egg white into a tin, shake with a single cube until ice cube is gone
Add all ingredients into tin with ice
Shake and double strain into a chilled cocktail glass
Garnish with a cinnamon stick and drops of Angostura Bitters