Topfengolatschen / Quarktaschen

Topfengolatsche is a typical Austrian pastry that everyone knows. Recipe for 16 slices Dough: 250g flour 125g milk 20g yeast 2 egg yolks 30g butter 30g sugar 1 pinch of salt Filling 250g curd cheese 60g sugar 2 egg whites 1 packet of vanilla sugar Grated lemon zest