Add raw or roasted hazelnuts to a food processor and process until you get hazelnut meal. Add remaining ingredients and process until mixture is of desired consistency - as smooth or chunky as you want (mine is a little bit chunky still).
Spoon into sterilised jars and store in the fridge for up to two weeks.
Recipe by @OmNomAlly at https://omnomally.com/2013/07/04/healthy-homemade-nutella/