I don't know exactly what happened. Maybe I accidentally burned the hazelnuts. Maybe I added too much salt. Maybe I should have used better quality chocolate. Maybe it just isn't a very good recipe. Whatever it is, the Nutella turned out good, but not great. It has a bit of a saltiness or a bitterness that I just don't love. If I do it again, I think I'll try a different recipe and not baking the hazelnuts for quite as long.