Directions

1. In a skillet over medium heat, brown the ground beef until no longer pink; drain excess fat.
2. Add chopped onion and cook until softened, about 3 minutes.
3. Stir in ketchup, tomato paste, Worcestershire sauce, mustard, and brown sugar.
4. Season with salt and pepper and simmer mixture over low heat for 10-15 minutes until sauce thickens.
5. Toast hamburger buns if desired.
6. Spoon beef mixture generously onto bottom buns and top with the other halves to serve.