INGREDIENTS
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2 pounds ground beef
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1 egg
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2 teaspoons dry mustard
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4 teaspoons Worcestershire sauce, divided
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2 tablespoons ketchup, divided
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1 teaspoon salt
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1/2 teaspoon ground black pepper
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2 tablespoons olive oil
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2 onions, thinly sliced
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1 tablespoon garlic, minced
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2 tablespoons all-purpose flour
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2 cups beef broth