Trim fat from beef and cut into 4 or 5 large chunks to fit in slow cooker/Crock Pot. Combine remaining ingredients and pour over beef. Cook in a Crock Pot for 8 to 10 (4 to 5 on high) hours on low. Pour juice into a small saucepan and simmer on the stovetop for 15 to 20 minutes to reduce and thicken. In the meantime shred beef with 2 forks or potato masher. Return thickened sauce to the beef in the slow cooker/Crock Pot. Keep warm and serve with buns and coleslaw. Makes 6 to 8 sandwiches.