In a pan, start by putting the bacon to fry, then remove, put the ground meat ball, put salt and pepper, let it seal for 2 minutes and then turn the side and put more salt and pepper.
Cut the bread in half, pass the melted butter in a frying pan, the 2 sides of it, and then apply mayonnaise and set aside.
Place the cheese on top of the meat ball, let the cheese melt, arrange the bacon on top, the onion.
Spread mayonnaise on the 2 sides of the bread, place the meat with the ingredients assembled by sima, tomato and lettuce, and that's it, put a toothpick in the middle so it doesn't fall apart and that's it.