Step 1

Season meat with garlic powder; place in slow cooker. Add beer and 1/2 cup barbecue sauce; cover with lid. Cook on LOW 8 to 10 hours (or on HIGH 4 to 5 hours). Meanwhile, mix mustard, sugar and vinegar until blended. Add to coleslaw blend in medium bowl; mix lightly. Refrigerate until ready to serve.

Step 2

Transfer meat to cutting board. Discard all but 1/4 cup sauce from slow cooker. Pull meat into shreds with 2 forks. Add to reserved sauce in slow cooker; stir in remaining barbecue sauce.

Step 3

Fill rolls with meat mixture and coleslaw just before serving.