In chicken fillet make an incision in the form of "pocket", then lightly repel.
Fill the pocket with 1/3 of the ketchup.
Put a strip of hard cheese inside.
Fix the incision with a skewer, salt and pepper.
Roll in flour, shake off excess.
Dip in beaten with a pinch of salt chicken egg.
Immediately roll on both sides in a pre-diced potato, fry on both sides in a frying pan heated with vegetable oil. Remove from heat, cover with foil to meat came to readiness or bring in the oven to full readiness.