Defrost the lemonade concentrate, and prepare according to package directions in a large pitcher.
Rinse the raspberries, and place them in a blender with ¼ cup water. Blend on high until smooth.
If desired, strain the raspberry purée through a fine mesh strainer, and discard the seeds.
Stir the raspberry purée into the lemonade.
Serve the lemonade in glasses with ice, fresh mint, and additional raspberries.
Notes
You can substitute 2 cups (1 pint) of fresh or frozen strawberries or blueberries in place of the raspberries to make strawberry lemonade.Make it boozy: replace 1 cup of water (when making the concentrate into lemonade) with 1 cup vodka. Make it sparkling: replace all of the water (when making the concentrate into lemonade) with sparkling water.You can make this with homemade lemonade, too (here's a good recipe!).