
Prepare the filling. Walnuts, if not peeled, clean. You can dry them for a couple of minutes in a dry pan, the nuts will become fragrant and tastier. Then grind them in any way available - with a blender, in a mortar or with a simple rolling pin, as I did. To do this, put the nuts in a bag and tap them with a rolling pin. Nuts will turn into small crumbs.