This hazelnut cake with chocolate frosting is a decadent dessert that will impress your guests. The cake is made with ground hazelnuts, flour, sugar, eggs, and butter. The frosting is made with chocolate, butter, and powdered sugar. To make the cake, you need to mix the dry ingredients in one bowl and the wet ingredients in another bowl. Then, you combine the two mixtures and bake the cake in the oven for about 40 minutes. Once the cake is cooled, you can frost it with the chocolate frosting. This cake is perfect for special occasions such as birthdays or holidays.