01 - Combine fresh lemon juice and granulated sugar in a large pitcher, stirring until sugar fully dissolves.
02 - Add mint leaves to the mixture and gently muddle with a wooden spoon to release essential oils.
03 - Pour in cold water and stir thoroughly to combine all ingredients evenly.
04 - Introduce ice cubes to the beverage and stir gently once more to chill the drink.
05 - Taste the lemonade and modify sugar content if necessary to suit personal preference.
06 - Pour lemonade into glasses and garnish with extra fresh mint leaves and lemon slices.