The author of the original short story this classic was based on was also often thirsty... Here's his namesake drink created at his favorite Havana bar, La Floradita
1½ oz. Martinique White Rum
½ oz. Luxardo liqueur
¾ oz. Fresh grapefruit juice
½ oz. Fresh lime juice
½ oz. Simple Syrup* (see Housemade Syrups)
Shake all with ice, strain and pour into cocktail glass. Garnish with lime wheel.
*If you want to truly drink like Hemingway, omit the simple syrup. He claimed it "just got in the way."