Rinse and disinfect the lettuce leaves the necessary amount of time.
Add salt and pepper to the beef to taste, and cut it in pieces, and then cook it on a pan with oil to medium heat.
Chop the cabbage and add the sugar, butter and let it caramelize on its own.
While the beef and cabbage are cooking, dry the lettuce with a kitchen towel and cut it in pieces.
Slice the tomato and cook it a little on a pan with oil.
Partir los panes por la mitad y poner a tostar en un sartén.
To ensemble the hamburguer, spread some mayo onto the buns, then put some lettuce on, then some slices os tomato, a little (or a lot) of caramelized cabbage, then some beef and then the cheese (which will melt because of the heat of the beef) and lastly the other half of the bun. You´re done!