01 - Roll lemons firmly on a countertop to soften, then cut in half and juice to obtain about 1/2 cup fresh lemon juice.
02 - In a pitcher or large glass, combine fresh lemon juice with granulated sugar and stir until sugar is fully dissolved.
03 - Add cold water to the lemon and sugar mixture and stir thoroughly. Adjust sweetness or tartness as preferred.
04 - Fill serving glasses with ice if desired, pour the mixture over, and garnish with lemon slices or mint leaves.