Coat meat with flour. In Dutch oven, brown meat on all sides in hot shortening. Season with salt and pepper. Remove from heat.
Add 1/2 cup water; cover; return to heat. Simmer until tender, 2 to 2 1/2 hours. Add water if needed. Pour off pan juices into measuring cup; skim off fat. Add water to juices, if needed to make 2 cups.
In pan, mix pan juice, beef broth, onion and Worcestershire. Bring to boil. Reduce heat. Simmer 5 minutes. Slice roast as thin as possible. Split hard rolls lengthwise almost all the way through. Place a few slices of meat in each roll. Serve each sandwich with 1/3 cup of broth.