Straws onions. Cut mushrooms. Fry the onion in oil. Add mushrooms, mix. Fry over high heat until cooked, salt, pepper to taste. Mushrooms skip through a meat grinder. Fold the foil in 6 layers. Cut the pita into 4 parts, you should get 8 sheets of pita bread. Put the first pita bread on the foil, grease with mushrooms, cover with the next pita and grease with mushrooms, etc. Lubricate the top pita and the edges with sour cream. Grate the cheese on a fine grater, distribute evenly over the surface and edges. Put in a preheated oven to 180 degrees only so that the cheese has melted, no need to bake. Cut the finished cake into portions. Enjoy your meal!