Chocolate custard cake, the recipe for which I will tell you in detail today, is a surprisingly tasty combination of air chocolate layers made of sponge on egg whites and a delicate custard cream. To make dessert even tastier, add fried walnuts to the sponge layers. They will make the taste of the chocolate cake with custard filling even more saturated and bright. In addition to nuts, dried fruits can be used to layer the cake, prunes or dried apricots are best suited. The chocolate sponge can be baked in advance and stored in a fridge, tightly wrapped it in a food wrap. Note that during the preparation of the cream, the custard base and butter should be approximately the same temperature, otherwise the cream may flake.