
Start by placing the ground beef on top of an egg carton and spread it out by pressing it with a glass baking dish.
Place it in the freezer and let it chill for 1 hour.
After this time has passed, cut the onions into thin slices.
Transfer them to a large baking tray and spread them out, lining the bottom.
Next, cover all the onions with the potatoes sliced into rounds.
Season with the salt and the black pepper.
Then add the mushrooms sliced into rounds and set aside.
In a medium bowl, add the ripe tomatoes cut into small cubes, the grated mozzarella cheese, the mayonnaise and mix everything very well until combined.
Add this mixture to the baking tray and spread it out.
Next, add the meat we left in the freezer.
Season with the salt and the black pepper.
Add the grated mozzarella cheese on top of everything.
Take to a preheated oven at 180° C (350° F) and bake for 40 minutes.
Serve.