Brown ground beef with onion, red pepper and garlic in a frying pan over medium heat. Add in ketchup, brown sugar, mustard and Worcestershire sauce. Season with salt and black pepper to taste.
Cover and simmer on low for 10-20 minutes, stirring occasionally. Add more ketchup or 1-3 Tablespoons water if need more liquid.
Serve on fresh hamburger buns.
Note: Nutrition value does not include hamburger buns. To toast your hamburger buns, heat 1-2 Tablespoons of butter on a griddle over medium heat. Then place the hamburger buns on and cook 1-3 minutes, or until the bottoms are lightly toasted. This will add great flavor and prevent the buns from getting soggy.