In a large skillet over medium heat, cook the ground beef, onion, bell pepper, and garlic until the beef is browned and the vegetables are softened, about 10 minutes.
Add the tomato sauce, ketchup, Worcestershire sauce, brown sugar, mustard powder, salt and pepper. Simmer for 10 minutes, stirring occasionally.
Spoon the mixture onto the hamburger buns and serve immediately.
Interesting Facts
Sloppy Joes are a classic American dish that originated in the early 1900s.
They were originally served on hot dog buns and called "loose meat sandwiches".
The sauce for Sloppy Joes is usually made with tomato sauce, ketchup, Worcestershire sauce, brown sugar, and mustard powder.