Melt the butter in a saucepan and let it cool down. Remove some of the milk and stir in the pudding powder. Bring the rest of the milk with sugar to the boil. Stir in the mixed pudding powder. Bring to the boil briefly while stirring. Take it from the stove and let it cool off.
Mix the eggs with sugar, vanilla sugar and salt. Squeeze the lemon. Stir the quark, lemon juice and flavor into the egg mixture. Mix with semolina, cornstarch and baking powder. Finally stir in the butter.
Grease a small springform pan and sprinkle with breadcrumbs. Fill in the curd mass.
Add the butter to the pudding and stir. Separate eggs. Stir the egg yolks into the pudding. Beat egg whites with salt until stiff. Fold into the pudding. Spread the mixture over the curd mixture and smooth it out.
Bake the cake in the oven at 175 degrees for about 45 to 50 minutes. Remove from oven and allow to cool. Detach from the mold.