Thinly slice lemons crosswise. Try to remove as many seeds as possible. Put lemon slices into a large punch bowl. Pour SPLENDA(R) Granulated Sweetener, over the top of the lemons. Using a potato masher or wooden spoon, pound lemons and sweetener mixture until granules dissolve and lemon slices are broken.
Add ice cubes and stir in cold water. Serve in tall glasses.