This delightful drink is one that you won't typically see. The first time I saw it in print was in the 2005 edition of “The Bartender’s Guide to Cocktails & Mixed Drinks” by Stewart Walton. I have since been trying to track down when this recipe might first have appeared, and to date, the oldest reference I have found is in the 1975 edition of Playboy's "Host & Bar Book" by Thomas Mario.
Garnish: grapefruit twist.
Shake with ice. Strain into a cocktail glass.