Blue Lemonade

5 cups water
1 to 1 1/2 cups granulated sugar, or to taste
Pared rind of 3 lemons
Juice of 6 large lemons (to make 1 cup)
1/2 cup blackberries
1/2 cup blueberries
Ice (for serving)

In a medium saucepan, combine 2 cups of the water with 1 cup of the sugar. Bring them to a boil over low heat, stirring until the sugar melts. Turn the heat up and cook over medium-high heat for 5 minutes, or until the syrup begins to thicken slightly.

Stir in the remaining 3 cups of water with the lemon rind and the juice. Remove the pan from the heat.

In a food processor or blender, puree the blackberries and blueberries and add them to the syrup. Let the mixture cool to room temperature and set it aside for 1 hour.

Strain well into a large pitcher to remove the seeds and skins from the berries. Chill until ready to serve. Serve over ice.