1: Preheat oven to 180°C (360°F). Pour 300 g hazelnuts onto a baking sheet.
2: Bake for 10 minutes at 180°C (360°F).
3: After this time, you'll see that the hazelnut skin has darkened and cracked.
4: Pour the hazelnuts onto a tea towel and leave to cool for a few minutes.
5: Fold back the tea towel...
6: ...and roll the hazelnuts back and forth between them for 1 or 2 minutes, pressing the cloth tightly.
7: Open the tea towel and remove the hazelnuts, which are already well peeled.
8: Fold the cloth over the remaining hazelnuts, and repeat the operation until all your hazelnuts are skinless.
9: You may have a few "resistant" hazelnuts, which retain a small piece of skin, as in the photo. There are three possible solutions: 1) Put them back in the oven on the baking sheet for 3 to 5 minutes, and start all over again. 2) Scrape off the remaining skins with a knife. 3) Keep them as they are, as this little bit of remaining skin isn't really a problem, unless your hazelnuts are going to be used for decoration.
10: You'll appreciate the difference in appearance and taste between raw hazelnuts and peeled, roasted ones.