Cut roast in half and place in a 3- or 4-qt. slow cooker. In a small bowl, combine ketchup, brown sugar, barbecue sauce, Worcestershire sauce, mustard, seasonings. Pour over beef.
Cover and cook on low for 8-10 hours or until meat is tender. Remove meat; cool slightly. Skim fat from cooking liquid.
Remove excess fat and discard. Shred beef with two forks place in a bowl. Spoon liquid over the shredded beef until desired consistency. Place ½ cup on each bun.
Serve with onions, pickles or jalapenos if desired.
House favorite is with provolone cheese and seasoned cole slaw.
Recipe by Sugar and Spice at https://kathleenssugarandspice.com/2012/08/13/crock-pot-barbeque-beef-sandwiches-recip/