01 - In a small saucepan, combine sugar and 1 cup of water. Heat gently, stirring continuously until sugar fully dissolves. Remove from heat and allow to cool slightly.
02 - In a large pitcher, mix freshly squeezed lemon juice with the cooled simple syrup until well incorporated.
03 - Add the remaining 3 cups of cold water to the pitcher and stir thoroughly.
04 - Taste and modify sweetness or acidity by adding additional sugar or lemon juice as preferred.
05 - Refrigerate for a minimum of 30 minutes until thoroughly chilled.
06 - Pour over ice and garnish with lemon slices and fresh mint leaves if desired.