1 ¼ oz. Cuba Libre white rum (or any white rum)
2 ½ oz. guarapo (Cuba Libre presses sugar cane to extract the juice called guarapo. Home bartenders can substitute simple syrup, though the amount will be closer to 1 oz.)
1 ¼ oz. lime juice
6 Hierba Buena leaves (or regular mint)
Lime wedge (for garnish)
Fill a cocktail shake halfway with ice. Tear mint leaves in half, and add to shaker with rum, simple syrup and lime juice. Shake vigorously. Pour into tall, narrow glass. Top with club soda, and garnish with a lime wedge.