Whip on low speed with a pinch of salt and then at high speed dorazbivat with brown sugar stirring up of snow. yolks are broken with 2 tbsp sugar, which previously separated from sugar egg whites. Add the buttermilk, ground walnuts, flour, cinnamon, baking soda and baking powder. Stir with a spatula followed by addition of the egg whites very carefully to the mixture to give a fluffy homogeneous mixture. Bake in greased and floured form with a diameter of 24-26 cm or cake pan in a preheated oven at 180C degrees for 50-60 minutes.