Onion-filled pie

From flour, salt, yolks and yeast diluted in a small amount of warm milk, knead the dough of medium consistency. Put the dough in a fat-greased baking sheet so that 2-3 cm high sides are obtained at the edges. For filling, salt the onions cut into thin circles and put them out in a grout, then tip the onions into a colander - eat extra fat. Place the onion filling on the base of the pie and bake in an oven preheated to 200 degrees. Mix all fill products. Pour the almost finished pie with egg-sour cream mixture and put in the oven for a few more minutes, until rosy.