Cheeseburger with Caramelized Onion and Bacon
Peel the onion and cut in half. Cut one-half into strips and set aside. Mince the other half finely. Process the ground beef with parsley, onions, egg, mustard, bread crumbs, salt, and pepper. Divide into 8 portions and form into a burger patty. Flatten and fry until golden brown for about 3 minutes on each side in hot oil.
Cut the bacon into strips and place in a pan. Add the onion strips and fry until soft.
Cut the rolls in half and fry briefly on the cut surfaces. Place a slice of cheese on the bottom of the bun. Place a burger on each bun and cover with another slice of cheese. Top with the bacon-onion mixture and cover with the other half of the bun.