Spread the hazelnuts onto a baking sheet lined with parchment paper and roast them for 20 minutes or so, until the skins start to fall off. Let the hazelnuts cool, and then rub the skins off the hazelnuts by grabbing a handful and rubbing them against each other. If the skins do not fall off easily, they need to be roasted more.
Place the hazelnuts and the remaining ingredients into a food processor. Process the ingredients together on the low setting, turn the processor off, scrape down the sides with a rubber spatula, and then process the mixture again on the high setting to thicken the consistency. The mixture will continue to thicken more on its own after it is left to rest.
Recipe by Eat Thrive Glow at https://www.eatthriveglow.com/homemade-nutella/