In a large skillet, cook the beef, sausage and onion over medium heat until meat is no longer pink; drain. Stir in the cheese, Worcestershire sauce and seasonings.
Spread rye bread slices with 1 heaping tablespoon of mixture; place on baking sheets. Broil 4-6 in. from heat for 3 minutes or until bubbly. May be frozen and broiled without thawing. If desired, sprinkle with parsley before serving.