While similar to other nut roll recipes, this filling is unique because it uses no egg whites or lemon and includes a delicious "Americanization" of the Slavic recipe by adding--whiskey! It adds a fantastic additional flavor; feel free to split the filling before adding whiskey if you'd like to reserve some spirit-free for the kids (though it cooks off and I've never met a kid who didn't like this). Makes a big batch--perfect for giving away. Freezes very well. My sister and I will make double this batch all at once and freeze them until we're ready to give/send them out.