From Death & Co
Garnish: 1 grapefruit twist
Shake all the ingredients with ice, then strain into a coupe.
Garnish with the grapefruit twist.
Created by Brad Farran, 2013. High West's oat whiskey is one of the few unaged whiskeys that stands out in a drink — it has enough of its own flavor profile, like this grapefruit-and-cinnamon-flavored sour.