Spray inside of slow cooker with non stick spray. Cut roast in half width wise and lay in bottom.
In a small bowl whisk the other ingredients (except salt and pepper) together to make a sauce/gravy. Pour this over your meat.
Cover and cook on low for 6-8 hours (timing will depend on how thick your piece is and how fall apart you want it to be). Once fork tender remove, shred or slice and serve with gravy. Season with salt and pepper when served.