Roughly chop the chocolate. Melt on a hot water bath, let it cool down a little. Separate the eggs. Cream softened butter, sugar, vanillin sugar and salt. Add the egg yolks one by one. Then stir in melted chocolate.
Mix flour and baking powder, stir in briefly. Beat the egg white until stiff, add icing sugar. Stir 1/3 beaten egg white into the dough. Carefully fold in the rest in 2 portions. Line the fat pan of the oven (32 x 37 cm) with baking paper. Pour in the dough and smooth it down. Bake in the preheated oven (electric range: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 25 minutes. Let cool down on a cake rack. Cut the dough sheet in half (32 x 18.5 cm). Spread one half of the cake with jam, place the second cake plate on top. For the glaze, chop the chocolate coating and melt in a hot water bath. Coat the cake evenly with the glaze and leave to dry in a cool place.
Let cool down on a cake rack. Cut the dough sheet in half (32 x 18.5 cm). Spread one half of the cake with jam, place the second cake plate on top. For the glaze, chop the chocolate coating and melt in a hot water bath. Coat the cake evenly with the glaze and leave to dry in a cool place. Cut the cake with a knife dipped in hot water, first into 3 approx. 6 cm wide strips, then into small triangles. Dust with cocoa. Serve decorated with strawberry slices and small chocolates
At 30 pieces: