For Batter
- Preheat the oven to 180-200°C.
- Melt chocolate in a double boiler over hot water (Bain Marie, "im Wasserbad").
- If you don't have a double boiler you can also use a normal pan filled with water and with a smaller pan in it.
- Remove from heat and let the mass cool, then do the same with butter and add it to chocolate.
- Add the sugar and the egg yolks little by little while carefully stirring.
- Beat the egg whites and mix into the batter.
- Then add the bakery powder and the flour gradually while constantly stirring.
- Pour batter into a greased spring form pan.
- Bake at 165°C for 50 to 60 minutes.
- Allow the cake to cool completely before removing from pan and before icing.
- Once cool remove the cake from pan then slice horizontally.
- Insert a filling of pureed jam between the layers.