Heat a large skillet over medium heat and add 1 lb of ground beef. Cook until no longer pink, about 5–7 minutes, and drain excess fat.

Add 1 medium finely chopped onion, 1 finely chopped green bell pepper, and 2 cloves of minced garlic to the skillet. Sauté for 3–4 minutes until soft and fragrant.

Stir in 1 cup of ketchup, 1 tablespoon of Worcestershire sauce, 1 tablespoon of brown sugar, and 1 teaspoon of mustard. Let simmer for about 10 minutes.

While the beef mixture simmers, toast your hamburger buns in a skillet or under the broiler until golden brown.

Spoon the savory beef mixture onto each toasted hamburger bun. Add desired toppings and serve immediately.