How to peel hazelnuts (Slideshow version)
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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.