Put all of the ingredients in a food processor with 4 tablespoons of boiling water and blitz until the mixture is finely chopped and well blended.
Transfer the mixture to a bowl and shape it into 15–20 balls.
Roll the balls in cocoa powder, desiccated coconut or chocolate sprinkles, as you wish. Chill on a plate in the fridge for at least 1 hour to firm up before eating.
The balls will keep in an airtight container in the fridge for up to 1 week.