Preheat the oven to 180C/160C fan/gas 4 and line or grease a 20 cm x 30 cm sized baking tray.
In a food processor or blender, add the chocolate pieces and pulse. Next, add the cooked beetroot, dates and butter (or coconut oil) and process. It won’t be completely smooth; there will still be shards of the chocolate.
Add the remaining ingredients; the eggs, flour, bicarbonate of soda, ground cinnamon, and pulse/blend again.
Transfer the to the baking tin and bake for 20 to 25 minutes, or until it has risen and is slightly firm.