Barbecue Sloppy Joes

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Ingredients

1. 1/4 cup vegetable oil
2. 1 medium onion, cut into 1/4-inch dice
3. 3/4 pound ground sirloin
4. 3/4 pound ground chuck
5. 1 large garlic clove, minced
6. 2 medium tomatoes—halved, seeded and cut into 1/2-inch dice
7. 1 1/2 cups ketchup
8. 3/4 cup prepared barbecue sauce
9. 1/4 cup tomato paste
10. 2 tablespoons cider vinegar
11. Salt and freshly ground pepper
12. 6 hamburger buns, split and toasted
13. 1/2 pound sharp cheddar cheese, sliced

1. In a large skillet, heat the oil. Add the onion and cook over moderately high heat until beginning to brown, about 6 minutes. Push the onion to one side of the skillet and add the ground sirloin and chuck. Cook, stirring, until browned, about 12 minutes. Add the garlic and cook until fragrant, 1 minute. Stir in the tomatoes, ketchup, barbecue sauce, tomato paste and vinegar. Simmer over moderately low heat, stirring, until the sauce is thick, 20 minutes. Season with salt and pepper.
2. Preheat the broiler. Set the bun bottoms on serving plates. Lay the cheese on the bun tops and broil until melted, about 1 minute. Spoon the Sloppy Joe mixture on the buns; serve.