Special Layered Cake with Cacao

Description
In Romanian: Tort special cu cacao

Ingredients
Filling:
 * 8 oz/250 g sugar,
 * 8 oz/250 g walnuts,
 * 5 egg whites,
 * rum,
 * 10 oz/300 g whipped cream,
 * oil;
 * 8 yolks,
 * 8 oz/250 g confectioner's sugar,
 * 8 oz/250 g butter,
 * 2 tablespoons cacao,
 * 2 tablespoons sugar,
 * 1/2 cup water

Directions
Bake at medium heat until golden.
 * 1) Caramelize 8 oz/250 g sugar.
 * 2) When it starts to turn yellow, add the walnuts, letting them roast a little.
 * 3) Remove from heat and spread on a cutting board, previously oiled.
 * 4) When cold, finely crush with a mortar and pestle.
 * 5) Whip the egg whites and mix with the roasted and crushed walnuts.
 * 6) Divide this mixture into 3 equal parts and bake, individually, in baking pans greased with oil and covered with parchment paper.
 * 1) Spread cream on the cooled sheets that were previously sprinkled with rum.
 * 2) Spread cream on the last layer as well.
 * 3) Then cover the whole cake with whipped cream.
 * 4) To get the cream, beat the yolks with the confectioner's sugar until creamy.
 * 5) Mix with the butter, previously creamed separately, then add the following, also previously prepared separately.
 * 6) 2 tablespoons cacao with 2 tablespoons sugar and 1/2 cup water are boiled until thickened.
 * 7) Mix everything very well.