In a desperate attempt to use up the remaining blackberries from our CSA which have not yet been made into jam, I decided that I would use some of the seedless blackberry puree (which I got from passing the blackberries through the fine blade of a food mill) to make a pitcher of this amazing blackberry lemonade. I mix one part freshly squeezed lemon juice, one part sugar (or to taste), one part blackberry puree, and five parts water (but you can add more or less depending on how strongly flavored you like yours to be). Very easy, but deliciously tart and refreshing. (This recipe would also work well with other fruits such as strawberries, raspberries, cherries, peaches, etc.) Enjoy!