In a medium bowl, mix together Dr. Pepper, BBQ sauce and Worcestershire sauce until well combined.
Season the beef roast generously on all sides with seasonings.
Place the roast in the slow cooker and pour the Dr. Pepper mixture over the top.
Cover and cook on low for 8 hours, or until the beef is tender and easy to shred.
Remove the beef from the slow cooker and shred it using two forks.
Strain and reserve the cooking juices, then pour them into a saucepan.
In a small bowl, whisk together cornstarch and water to make a slurry, then slowly stir it into the juices.
Heat over medium heat, stirring frequently, until the sauce thickens.
Place slices of provolone cheese on one half of the ciabatta rolls and broil until melted and bubbly.
Add the shredded beef to the rolls, drizzle with the thickened sauce, and serve warm.
Enjoy!