Step 1

In a large saucepan, combine sugar, lemon zest and 1 1/2 cups water.

Step 2

Cook over medium heat until the sugar is completely dissolved (about 4-5 minutes).

Step 3

Remove from heat and stir in lemon juice. Let the syrup cool and then add the remaining water and stir. Pour the mixture into a half gallon size mason jar or pitcher and refrigerate until cold.

Step 4

Serve over ice with additional lemon slices (optional). Refrigerate any leftovers.