Peel avocado, discard stone and place green flesh into a food processor.
Add other ingredients and blend until smooth.
Taste test and adjust to your preferences - add more cacao if you want a deeper chocolate flavour or add a touch more sweetener if you want to sweeten it further. Blend again.
Enjoy immediately for a pudding texture, or for a thicker mousse-like texture place in the fridge for an hour to firm.