Begin by frying the onion, add the onions to a larger pan with butter and olive oil and fry them for some time. Add the seasoning including salt and pepper.
Put the fried onion aside, and now add your beef steak in the pan, put in some lime juice, and grill for 2-3 minutes, until browned and completely cooked.
While steaks are cooking, mix 2 minced garlic cloves in the mayonnaise and also a pinch of salt.
Take your bread slices, spread the prepared sauce over it, and Now is the time for filling your steak sandwich.
Put some leaves of parsley at the bottom and place your beef steak over it.
Fill with onion and tomatoes and the fried potato sticks to make your sandwich a layered one. They spread some cheese over it and again place shredded lettuce leaves. Then put the other bread slice over it.
To melt the cheese, and to heat the bread a little bit, Put it in the oven for a few minutes.
Take it out from the oven, and there you go. Your perfect cheesy steak sandwich is ready.
Serve it with the pickle slices that will glorify its taste.