Boil the potatoes and mash them. Add 2 eggs and 1 egg white (egg yolk leave spreads of the roll), the butter, chopped onion, breadcrumbs and spices. Knead dough and spread on kitchen foil. Arrange whole boiled eggs, carrots, pickles, chopped bacon and corn. Shape roll, transfer it in a baking dish, greased it with egg yolk and sprinkle with plenty of grated cheese. Bake at 220C for approximately 25-30 minutes.