Ernest Hemingway drank this at El Floridita in Havana — he asked the bartender to double the rum and skip the sugar. The result is a perfectly dry, citrus-forward daiquiri also known as the Papa Doble.

• White rum6 cl
• Fresh lime juice1.5 cl
• Fresh grapefruit juice4 cl
• Maraschino liqueur1.5 cl

1. 1Combine all ingredients in a shaker with ice.
2. 2Shake vigorously for 15 seconds.
3. 3Double strain into a chilled coupe glass.
4. 4Garnish with a lime twist or a grapefruit slice.