1/2 cup lime juice
1/3 cup sugar
1/2 cup packed mint leaves
1 12-ounce bottle cold sparkling water
Lime slices and mint sprigs for garnish
Combine lime juice, sugar and mint in a blender. Puree until smooth. Fill two tall glasses half-full with ice cubes. Pour half of the lime juice concentrate in each. Top with sparkling water, garnish and serve.