Start by preparing the peaches. Cut the ripe peaches into slices and place them in a blender.
Add the freshly squeezed lemon juice, granulated sugar, and water to the blender. Blend the mixture on high speed until smooth and the sugar is dissolved.
In a separate container, combine the ice cubes with about 1 cup of water and blend until you get a slushy consistency.
Pour the blended peach and lemon mixture into the slushy ice mix and blend gently to combine. If it's too thick, add a bit more water to achieve your desired slushiness.
Taste the mixture and adjust the sweetness by adding more sugar if necessary. Blend lightly to mix.
Serve the frozen peach lemonade immediately in chilled glasses.
Garnish each glass with a sprig of fresh mint and a slice of lemon on the rim.
Notes
Adjust the sweetness to your preference by adding more sugar if needed.