Grease an oven dish with oil.
Cut the meat into small pieces, salt and pepper.
Peel and chop the onion and add to the meat.
Peel and cut the potatoes into the same cubes as the meat, add salt and pepper.
Lubricate with mayonnaise.
Grate the cheese on a medium grater and place on mayonnaise.
Place in the oven for approximately 1 hour 20 minutes at 180 degrees. Bon appetit!
Before serving, the dish can be sprinkled with herbs.