1 lb ground beef
1 small onion, finely chopped
1 green bell pepper, finely chopped
2 cloves garlic, minced
3/4 cup ketchup
2 tbsp tomato paste
1 tbsp Worcestershire sauce
1 tbsp brown sugar
1 tsp yellow mustard
1/2 tsp salt
1/4 tsp black pepper
1 tbsp oil
4 hamburger buns
Heat oil in a skillet over medium heat
Add onion and bell pepper
Cook until softened
Add garlic
Cook for 30 seconds
Add ground beef
Cook until browned
Drain excess fat
Stir in ketchup, tomato paste, Worcestershire sauce, brown sugar, mustard, salt, and black pepper
Simmer for 5 to 10 minutes
Spoon mixture onto hamburger buns
Serve immediately