INGREDIENTS
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1 onion, chopped
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4 lb bottom round beef roast, trimmed of any visible fat
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1/2 cup ketchup
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2/3 cup cola
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2 Tbsp Dijon mustard
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1 1/2 Tbsp Worcestershire sauce
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1 tsp salt
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1/4 tsp pepper
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1/4 cup water
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3 Tbsp cornstarch
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12 soft sandwich rolls