Brown 450g of ground beef in a large skillet over medium-high heat, breaking it up. Drain off the fat.
Add ½ cup of chopped yellow onion and 2 minced garlic cloves and cook until the onion is soft.
Stir in 225g of tomato sauce, ⅓ cup of ketchup, ¼ cup of barbecue sauce, 1 tablespoon of Worcestershire sauce, 1 teaspoon of yellow mustard, and ½ teaspoon of garlic powder. Season with salt and pepper.
Simmer for 20 minutes, stirring occasionally, until thickened. Spoon onto 5 toasted hamburger buns.
