Start by chopping the hazelnuts and frying them in a dry pan until lightly toasted. Lightly grease a baking sheet. Chop the chocolate and hazelnuts finely to ensure even distribution in the finished biscuit. Put all the remaining ingredients in a bowl and beat together until they start to form a ball. It will look like a bowl of hopeless crumbs but keep going; it will make a lump eventually. Get your hands in the mix to bring all the mix into one ball. Lightly knead the dough.
Place the dough in the middle of the prepared baking sheet and then roll it out until it is about 20cm in diameter Pinch, crimp or fork the edges of the dough to give it a nice edge. Prick the top with a fork and bake in a preheated oven at 160C for 40-45 minutes or until firm. Mark into wedges while still hot.