Place beef on onion in a 3 1/2-qt or larger slow-cooker. Mix ketchup, cola, mustard, and worcestershire sauce in a bowl, pour over beef.
Cover and cook on low 8-10 hours. remove beef to a plate; cover loosely with foil. Increase cooker heat to high. Stir cornstarch and water in a small cup until dissolved. Stir into liquid in cooker; cook 15 to 20 minutes until thickened.
Thinly slice beef, layer on buns and spoon sauce over top.
Originally Submitted
1/30/2009
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