Make a shortcrust pastry (kneading dough) and refrigerate.
For the filling, stir together butter, sugar and vanilla sugar until creamy, add sour cream and eggs (stir well). Finally stir in the pudding powder.
Place the dough on a baking sheet or in a square baking frame (roll out). Put the mixture on the dough and bake both together. 200 degrees middle rail 45 - 50 minutes.
Spread about 1 kg of currants on the cooled dough (if you want, you can spread jam under it).
Mix 2 packets of glaze (red or white) with 1/4 l of currant juice or raspberry syrup and 1/4 l of water and prepare a glaze from it and spread it on top.