Add all ingredients for the dough to the mixing bowl and knead for 1 min./kneading speed.
Knead dough again with hands on a floured countertop, wrap in plastic wrap and refrigerate for 30 minutes.
Filling:
Add all ingredients except curd to the mixing bowl and mix for 30 sec./speed 4.
Add the quark and mix for 30 sec./speed 3. The filling is very liquid, but this is normal. Preheat oven to 175 °C convection heat.
Grease springform with butter. Roll out the chilled dough on a floured countertop and place in the springform pan, making sure to raise the edges.
Pour the filling on the dough and bake on the middle rack of the oven for 1 hour 15 minutes. After 30 minutes of baking, cover the cake with aluminum foil. After the baking time, leave the cake in the closed oven for another 15 minutes.
Do not cut the cake until it has cooled completely.