Pour in the rye whiskey, Fernet-Branca, simple syrup and Angostura Bitters.
Stir for 30-45 seconds.
Strain into a coupe glass and garnish with an orange twist.
Video
Notes
Whiskey - traditionally would use a Canadian whiskey, but you can experiment and see which whiskey you prefer. Simple Syrup - equal parts water and sugar heated in a saucepan. Stir until sugar dissolves and then cool. Will keep for about a month in the fridge in an airtight container.