Heat the chocolate until just melted, and set to one side.
Scoop out the flesh of the avocado and place in a food processor.
Blitz until it is nice and smooth, scraping down the sides as you go.
Add the melted chocolate and honey/maple syrup and mix until everything is well combined.
Pour out into a bowl and refrigerate for around 30-60 minutes (or until you are able to handle the mixture and roll into balls).
Roll into around 12 balls.
For half of them, flatten the balls and place a whole hazelnut in the centre. Roll it back into a ball so the hazelnut is covered.
For the others, roll the balls in crushed/chopped hazelnuts until they have a nice, even covering.
Store in the fridge until ready to eat. Enjoy!