Wash the lemons thoroughly to remove any wax or dirt from the skins. Cut the lemons in halves to fit the feeding chute of your slow juicer.
Using your Fretta Edge Max Slow Juicer and select the Soft Mode to extract the lemon juice. Collect the fresh lemon juice in a pitcher, then add in the granulated sugar. Stir well until the sugar is completely dissolved.
Pour in the cold water and stir to combine. Taste the lemonade and adjust the sweetness by adding more sugar if desired.
Fill glasses with ice cubes and pour the lemonade over the ice. Garnish each glass with a lemon slice and a sprig of mint leaves for a refreshing touch. Serve immediately and enjoy!