It's a sweet bread dough with hazelnut mix in the middle.
25g sugar (I put in much more)
Make the dough with the above and when it's all risen and ready form into balls with the following mix inside:
160g ground hazelnuts
(actually I just used sugar, it was fine)
Rise again, bake. When done brish over with melted butter and sugar for a nice crunchy finish. Meant to be serves with custard (vanilla sauce) but I found them fine as they were.