Makes 6 cups
1 cup granulated sugar
1 cup plus 3 cups water, cold
1 cup lemon juice (from 5-6 lemons)
1 lemon, sliced for garnish
First make a simple syrup: In a small sauce pot, combine the sugar with 1 cup water. Stirring occasionally, bring to a simmer over medium heat. Remove from the heat and allow to cool. Refrigerate until read to use.
Combine the cooled simple syrup with the remaining 3 cups of cold water and the lemon juice, and thoroughly mix. Pour into lemon-garnished glasses filled with ice cubes.