INGREDIENTS
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1 pound extra-lean ground beef
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1 cup frozen mixed vegetables
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1 cup diced green sweet pepper
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1/3 cup no-salt-added tomato paste (1/2 of a 6-ounce can)
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2 tablespoons balsamic vinegar
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2 teaspoons Worcestershire sauce
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3/4 teaspoon salt
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8 reduced-calorie whole grain hamburger buns