-
Combine 2 c water and sugar in a saucepan; bring to a boil.
-
Stirring occasionally, boil for 2 minutes.
-
Remove from heat; add in the lemon juice, lemon peel and remaining 2 c water.
-
Cool slightly.
-
Combine 1 c of the lemon mixture, and the blackberries in a blender.
-
Blend well; strain the mixture and discard the seeds.
-
Pour the blackberry and remaining lemon mixture in a pitcher.
-
Stir well and add food coloring if desired.
-
Chill and serve over ice.