Make your own onion jam: peel the red onion and chop it into fine slices. Place a small pan with the peanut oil on the heat. Add the onion slices and sprinkle the sugar over them. Let everything caramelize and then deglaze with the apple or balsamic vinegar.
Season the ground beef with pepper and salt. Mix well. Divide the meat into four equal parts and roll them into balls. Then flatten them into hamburgers.
Put a knob of butter in a pan and fry the strips of bacon in it. Make sure they are nice and crispy, then remove them from the pan. Fry the hamburgers on both sides in the pan. Meanwhile, let the second knob of butter melt in another pan and fry the eggs in it.
Wash the lettuce thoroughly and slice the tomatoes. Cut the blue cheese into three slices and the pickles lengthwise into slices.
Cut the rolls open and spread them with the onion jam. Top each roll with a leaf of lettuce, a hamburger, two slices of bacon, a few slices of tomato, some slices of pickle, and a slice of blue cheese. Finish with the fried egg.
Did you know? When you say hamburger, you think of America. Yet the roots of the hamburger lie here in Europe, in... Hamburg. There, the meat was first cooked and then served on a round bun. German immigrants who moved to the United States brought this recipe with them, creating one of the most iconic dishes in American history.
Tip: Do you really want a top hamburger? Then ask for a 'cuisson'.