If starting with fresh lemons, first juice approximately 6 lemons and measure out 1 cup lemon juice.
Add the lemon juice, 1 cup granulated sugar, 1 cup packed fresh mint leaves, and 4 cups cold water to your blender and blend until the mint is finely blended.
Pour the lemonade through a fine mesh strainer into a pitcher or directly into glasses over ice. Garnish with fresh lemon slices or wedges and/or mint leaves or sprigs as desired.