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1 tablespoon vegetable oil
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1 small onion, finely chopped or 1 garlic clove, finely minced
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1 (4-ounce) can crushed tomatoes
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1 tablespoon tomato paste
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1 teaspoon Worcestershire sauce
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1 teaspoon Dijon mustard
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1/2 teaspoon paprika
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salt and pepper, to taste
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1 1/2 pounds lean ground beef
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4 hamburger buns, toasted
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