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4 teaspoons olive oil

1 medium onion, chopped

2 garlic cloves, finely chopped

1 medium red pepper, chopped

1 small green pepper, chopped

1 stalk celery, chopped

2 pounds ground beef chuck

1 can (28 ounces) whole tomatoes in puree, chopped

2 tablespoons light (mild) molasses

1 tablespoon cider vinegar

1 teaspoon salt

1/4 teaspoon ground black pepper

6 hamburger buns, split