Grind biscuits and pour warm with sweetened with sugar (no 12 tbsp) milk. Add the walnuts and stir well. The butter, egg yolks and cocoa crash and add to the biscuit mixture. Spread half the mixture on greased baking dish or tray. Arrange banana cut into rings. Insert the remaining mixture on top. Top cover with cream of egg whites broken down with 12 tbsp sugar on hard snow. Sprinkle with chocolate sprinkles or grated chocolate. Put it in the refrigerator to set.