"Fifty years ago, my Dad used to have this burger at lunch with his business clients in a nice restaurant in Detroit, Michigan. They all raved about them all the time. I don't remember the name of the restaurant, and chances are it is long gone... but the burger is still YUM!"
Preheat an outdoor grill for medium heat, and lightly oil the grate.
Mix together the ground beef, Worcestershire sauce, parsley, and salt and pepper in a bowl, and divide the mixture into 4 portions. Make each portion into a ball, and form a pocket in each ball. Stuff the balls with about 1/4 cup crumbled Roquefort cheese, and gently pat and flatten each ball into a bun-sized burger.
Grill the burgers on the preheated grill until no longer pink in the middle, the cheese is melted, and the burgers show nice grill marks, 7 to 8 minutes per side.
Serve burgers in heated kaiser rolls, with sliced onion, lettuce, and tomato on the side.