From Death & Co
Shake all the ingredients (except the grapefruit twist) with ice, then strain into a coupe.
Squeeze the grapefruit twist over the drink and discard.
No garnish.
Created by Thomas Waugh, 2008. A riff on the classic Pegu Club cocktail, with Fernet-Branca and grapefruit juice in place of the usual bitters and orange curaçao.