This refreshing recipe for mint limeade comes from Martha Stewart Weddings, Spring 2005.
Bring granulated sugar and 1 cup water to a boil in a medium pan over high heat. Stir until sugar is dissolved. Refrigerate until chilled, about 1 hour. Add sugar syrup and mint to a blender; puree. Pour through a very fine mesh sieve into a large serving container; discard solids.
Add lime juice, superfine sugar, and 2 quarts water to a serving container. Stir until sugar is dissolved. Refrigerate until ready to serve, up to 1 day.
To serve, add ice cubes to fill and garnish with lime slices.
The original recipe is double the recipe from the show and can make 1 1/2 gallons which would serve 24.