Directions

1. Brown the ground beef and chopped onion in a large skillet over medium heat until beef is cooked and onions are soft.
2. Drain excess fat from skillet.
3. Add beef broth, Worcestershire sauce, mustard, salt, and pepper. Simmer uncovered for 10 minutes, stirring occasionally, until mixture thickens.
4. Taste and adjust seasoning as needed.
5. Pile the loose meat mixture onto toasted buns.
6. Add desired condiments or cheese and serve warm.