Start by making the mint syrup: heat the sugar and water together in a saucepan over medium heat. Allow the mixture to boil and sugar to completely dissolve. Add the mint leaves and let simmer for 10 minutes. Allow to cool before adding to lemonade.

To make the lemonade: add 1 1/2 cups of blackberries to a food processor or blender. Blend for 2 minutes until the mixture resembles thin jam.

To make the lemonade: to a large pitcher combine, 2 cups of squeezed lemon juice, 2 cups cold water, 1 cup blackberry juice, 1/2 cup of sugar and all of the mint syrup. Stir until well combined. Keep refrigerated until ready to serve.

Serve over ice and garnish with fresh blackberries and mint leaves.