Stir the butter until foamy, sprinkle in the sugar, stir in the egg yolks, fold in the sifted flour with baking powder. Spread on a large greased baking sheet. Now beat the egg white until stiff, sprinkle with sugar and fold in the ground nuts. Spread the mixture on the dough base and bake golden yellow at 170 ° C in the electric oven for about 25 minutes. Then you divide them into triangles and dip the ends in the chocolate icing.