INGREDIENTS
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2 Tablespoons olive oil
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½ large yellow onion, chopped
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1 pound ground lean beef or turkey
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½ teaspoon salt
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½ Tablespoon ground chili powder
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2 teaspoons Dijon mustard
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1 Tablespoon apple cider vinegar
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½ cup ketchup
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2 Tablespoons brown sugar
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2 Tablespoons Worcestershire sauce
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1 (8 oz) can tomato sauce
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4-6 whole wheat hamburger buns