Put everything into a high speed blender and blitz until smooth and icy. Serve.
Notes
If you make this out of season, use frozen berries and cut the quantity of ice cubes down by half. If your blackberries aren't very ripe, add less apple cider vinegar.
Recipe by Autoimmune Wellness at https://autoimmunewellness.com/berries-mint-and-apple-cider-crush/