Squeeze lemons to obtain 3/4 cup fresh lemon juice, removing seeds.
Creating Simple Syrup
Combine 1 cup sugar and 1 cup water in a saucepan. Heat over medium, stirring until sugar dissolves. Cool completely.
Muddling the Mint
Gently muddle 30-40 mint leaves in a pitcher to release oils, avoiding bitterness.
Combining Ingredients
Mix lemon juice, cooled simple syrup, muddled mint, and 4 cups water in a pitcher. Add ice, garnish with mint sprigs and lemon slices, and adjust taste as needed.