Sprinkle beef with salt and pepper. Heat oil in sleeve to slow cooker on the stove over medium high heat. Add beef and sear until brown on all sides. Add onions, garlic, bay leaf, Worcestershire, tomato paste hot sauce and broth. Place sleeve in the slow cooker and cover and cook for 4 hours on low until meat begins to fall apart with the pull of a fork. Remove meat from the cooker and slice into 1/4 inch slices or shred it. Ladle the fat from the top of the jus and discard. Reserve the jus from the cooker. Slather both sides of the bread with the cheese and top with beef and onions. Serve with side bowls of the jus for dipping.