Add in ½ tablespoon tart cherry concentrate, 2 teaspoons sugar, 1 tablespoon fresh lime juice, and 1 tablespoon fresh mint leaves into each glass.
Mash everything together with the back of a wooden spoon.
Fill up the glasses with pebble or crushed ice and then fill to the top with the cherry-flavored sparking water. (Divide the sparkling water evenly among the four glasses).
If desired, garnish with additional mint leaves and a sliced lime.