Wash and pat dry lemons and ginger. I do not peel ginger, it has a lot of flavors and nutrition. Just make sure to rinse thoroughly and wipe it with paper towels. Cut each lemon into half and juice using a lemon squeezer. Four large lemons will yield approximately ½ cup of lemon juice. Grate the ginger, 3 inch ginger should yield about 3 tablespoons of grated ginger.
In a small jar add ginger, sugar, salt and lemon juice. Add 1 cup of water and stir well until the sugar dissolves.
Take a large pitcher (ideally the one from which you will be serving) and place a strainer over it. Pour the lemon juice mixture and gently press with the back of a spatula to get all the juices out. Add 4 cups of chilled water, mix well. Serve over ice, top with mint leaves (optional) for a pop of color.