01 - In a small saucepan, combine sugar and 1/2 cup water. Heat over medium heat, stirring continuously, until the sugar has fully dissolved. Remove from heat and set aside to cool completely.
02 - Add the sliced peaches, freshly squeezed lemon juice, and lemon zest to a blender. Purée on high until completely smooth.
03 - Pour the peach purée through a fine-mesh sieve into a large pitcher, pressing with a spatula to extract as much liquid as possible. Discard the solids.
04 - Add the cooled simple syrup and 3 cups of cold water to the pitcher. Stir thoroughly until well combined.
05 - Taste the lemonade and adjust sweetness or tartness by adding more sugar or lemon juice as desired.
06 - Refrigerate for at least 1 hour to allow the flavors to meld, or serve immediately over ice.
07 - Pour over ice-filled glasses and garnish with fresh mint leaves, peach slices, and lemon wheels.