Add all ingredients into the food processor, except the ground flax seeds. Process until very smooth. Add the ground flax seeds and process again until you can’t see the flax.
Scrape the mixture into a three quarter inch deep tin (with greaseproof paper if you wish), and spread it evenly. Freeze for two hours. Cut into 1 inch squares and freeze for a further hour before removing and eating.
Makes about 30-40 pieces.
Recipe from Naked Chocolate by David Wolfe and Shazzie.