8 slices of provolone cheese (2 slices per burger)
In a large bowl, combine 1 tablespoon Worcestershire sauce, 2 teaspoons mustard and half of the onions. parsley flakes. Crumble beef over mixture; mix well. Form into four patties.
cook, covered, over medium heat or 4 to 5 minutes per side and until juices run clear.
Meanwhile, cook remaining onions. in a seperate sauce pan on medium cover with a lid and cook for 10 minutes with 2 tb of oil or until onions tender. Serve on Kaiser rolls.toast rolls in a skillet before serving