In a small saucepan add the sugar and 1 cup of water. Stir to dissolve the sugar while the mixture comes to a boil, remove from heat and let it cool.
Slice the lemons in half and use a manual hand juicer to remove all the liquid from each lemon. Pour the liquid into a measuring cup and pick out any seeds. Continue juicing until you have about 1 ½ cups fresh juice. You can strain the juice if you prefer no pulp.
Add 8 cups of ice-cold water into a pitcher. Add in the fresh lemon juice and add the simple syrup. Stir to combine.
You can add more water to taste if you find this too sweet.
Add ice a fresh ½ slice of lemon to the glass and enjoy!
Notes
Nine medium lemons should equal about one and a half cups of juice depending on the size and quality of the lemons you use.