Walnut Layered Cake

Description
In Romanian: Tort de nuci

Ingredients
Filling I: Filling II:
 * 10 egg whites,
 * 2 cups confectioner's sugar,
 * 2 cups ground walnuts,
 * butter,
 * icing;
 * 14 oz/400 g butter,
 * 3 yolks,
 * 1-2 tablespoons cacao or chocolate,
 * 1 cup confectioner's sugar;
 * 14 oz/400 g butter,
 * 3 yolks,
 * 1 teaspoon vanilla or grated peel from 1 lemon,
 * 3 tablespoons sour cream,
 * 1 cup confectioner's sugar

Directions

 * 1) Whip the 10 egg whites, then add the sugar, beating continuously.
 * 2) When the sugar has melted, add the ground walnuts and fold in gently.
 * 3) Pour some of the resulting mixture into the baking pan that was covered with buttered paper.
 * 4) The layer must be about 1 finger thick.
 * 5) The number of sheets depends on the size of the pan.
 * 6) After baking each sheet individually, let cool.
 * 7) Then spread with the desired cream (chocolate, butter, etc.) and arrange one on top of the other. Glaze with the desired icing.
 * 8) The most appropriate fillings for this cake are the following.
 * 9) I. Cream 14 oz/400 g butter, adding 3 yolks one by one, 1-2 tablespoons cacao or grated chocolate and 1 cup confectioner's sugar.
 * 10) II. Cream 14 oz/400 g butter with 1 cup confectioner's sugar and then add 3 yolks one by one, 1 teaspoon vanilla or grated peel from 1 lemon (or 1/4 cup rum) and 3 tablespoons sour cream.
 * 11) Mix everything well until creamy.