In a small saucepan place blackberries, peach slices and water and sugar. Heat on low to medium heat for about 10 minutes until liquid is simmering and water has started to dissolve. If desired, mash the blackberries and peaches for flavor and color.
Let cool to room temperature. Strain with a fine mesh strainer.
Peach Blackberry Lemonade
Juice lemons and strain juice into a pitcher. Add cold water and cooled simple syrup. Stir to mix.
Add remaining peaches and blackberries to pitcher. Refrigerate for 2 hours before serving.