1 cup fresh blueberries, plus extra for garnish A bunch of fresh mint leaves 1/2 Cup of White Rum 3/4 Cup of Soda Water 2 teaspoons sugar Juice of 2 limes Ice In a blender, puree blueberries until smooth. Set aside. Add mint leaves and sugar to a cocktail shaker. Use a muddler (or the end of a wooden spoon) to muddle the mint and sugar. Add the lime juice, rum and pureed blueberries: shake vigorously.Pour ice and soda water into two tall glasses and then pour in rum mixture.