The daiquiri, which made its formal debut in the United States at Washington's Army and Navy Club in 1909, is a fairly simple drink. The more familiar slushy version was created by a Havana bartender, who added crushed ice.
1 1/2 oz. dark rum
Juice of 1/2 lime
1 tsp. Simple Syrup
1. Fill a cocktail shaker with ice. Add rum, lime juice, and syrup. Shake well, then strain into a chilled cocktail glass.