Step 1

Remove string or netting from pork, if present. Trim fat from pork. If necessary, cut roast to fit into a 4- to 5-quart slow cooker. Place meat in cooker. In a medium bowl stir together ketchup, celery, onion, water, honey, lemon juice, vinegar, mustard, Worcestershire sauce and pepper. Pour over meat in cooker.

Step 2

Cover and cook on low-heat setting for 13 to 14 hours or on high-heat setting for 6-1/2 to 7 hours. Remove meat from cooker, reserving sauce. Using 2 forks, shred meat and place in a large bowl.

Step 3

Skim fat from sauce. Add enough of the reserved sauce to moisten pork (about 1 cup). Spoon about 2/3 cup pork atop each tortilla. Roll up and cut in half to serve.