Add the peaches, strawberries, and water to the bowl of a large blender or food processor and process until pureed.
Pour the pureed peach and strawberries through a fine mesh strainer and into a large bowl. Use a spoon to help push the puree around and through the strainer (see notes). DIscard any bits remaining in the strainer and set bowl aside.
For the Homemade Simple Syrup
Add the granulated sugar and water to a small saucepan over medium heat. Bring mixture to a low boil, stirring occasionally. Allow mixture to boil for 3 minutes or so, or until mixture becomes syrupy. Set aside to cool.
For the Lemonade
Fill a large pitcher with ice. Add the fresh lemon juice, peach and strawberry puree, and simple syrup. Mix well to combine. Fill with water (approximately 6-8 cups) and stir well. Cover and store in the refrigerator until ready to serve. When ready to serve, serve in glasses with ice and desired garnishes. Enjoy!
I pureed my fruits in my Vitamix. This blender blends so well that I didn't have much leftover seeds or skin left behind in the strainer. If this is you, that's ok, you didn't do anything wrong.