How to make
Beat the butter and sugar well, add the eggs, then the ground walnuts, flour, cocoa and spices. Finally, add the rum and lemon zest. Mix and knead a soft dough, you need to split it into 2 parts.
Spread one side in a greased and lightly floured cake form and smear it with jam. Form strip from the remaining dough, in order to form a grid on top of the jam. Bake the Viennese cake in a preheated oven for about half an hour.
10 minutes before it is ready, sprinkle it with chopped almonds or hazelnuts and bake finished.
