Pour can of beef broth into slow cooker, and add boneless pork roast. Cook on high heat for 4 hours, or until meat shreds easily. Remove meat, and shred with two forks. Pour out all of the beef broth and rinse out slow cooker. Put shredded meat back into the crock pot, add BBQ sauce, stir and cook on low heat until ready to eat. Serve on rolls or buns.