In a medium bowl mix the ground flax seeds with 3 tablespoons of cold water and set aside
In a large bowl put the flour, baking powder, bicarbonate of soda and coconut sugar, stir together
Unwrap 2 of the Grenade bars and either chop very finely with a sharp knife or whizz in a food processor until well chopped
To the flax seed mixture add the milk, yoghurt and vinegar
Preheat your oven to 180 Fan / 200 C / 400 F / Gas 6 and grease your donut moulds with a little oil or spray oil
Add the bowl of wet ingredients to the bowl of dry and mix thoroughly together, making sure no pockets of flour remain
Spoon into a piping bag either with just the end snipped off or a fairly narrow plain nozzle fitted
Pipe the batter into the moulds, filling each recess 2/3 full
Bake for 25 minutes until well risen and golden
Leave to cool for 5 minutes in the moulds before popping out then leave to cool on a wire rack
Once the donuts are cooled, break the chocolate into chunks and melt in the microwave or over a bain-marie (a heatproof bowl set over a pan of barely simmering water)
While that's melting roughly chop the remaining Grenade bar - you want smallish pieces but some nice definable chunks!
Dip the smooth, rounded side of the donuts into the chocolate then sprinkle with some of the chopped up Grenade bars
Leave the chocolate to set before storing in an airtight container
Recipe by The Cook & Him at https://thecookandhim.com/recipes/go-nuts-donuts/