Thoroughly wash the blackberries, then purée them in a blender until smooth.
Strain the blackberry purée through a fine-mesh sieve to remove the seeds. Pour the clear purée into a large pitcher.
Add the lemon juice and sugar to the pitcher, and stir until the sugar is completely dissolved.
Pour in the cold water and mix well. Taste, and if needed, add more sugar or lemon juice to adjust the sweetness.
Place the pitcher in the refrigerator and let it chill for at least 1 hour to allow the flavors to meld.
When serving, pour the lemonade into glasses, add ice cubes, and garnish with fresh mint leaves and a few blackberries.
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