Knead the ingredients for the dough with the mixer, it should be medium-firm. Let the dough rise in a warm place for an hour.
Grease a baking sheet. Roll out the dough on a floured surface, place it on the baking sheet and form a small edge.
Mix the sour cream, milk and flour well with a whisk, season well with salt, pepper and caraway seeds. Finally stir in the onions. Spread the topping evenly on the dough.
Bake the cake at 220 ° C for about 30 minutes until it has a nice color.