When meat is brown, add water and reduce heat to 300°F. Cover and cook slowly until tender, about 3 hrs. Adding water as needed.
When meat is done, remove from pan. Let stand 1/2 hour before slicing.
For gravy, stir flour and cold water with a wire whisk until smooth. Add to drippings in pan. Remove excess fat and add enough water to make one gallon of gravy, stirring with whisk until smooth. Stir in salt and pepper.
Arrange sliced beef in pans. Add hot broth to pan to help stay moist. Cover and return to oven to keep warm until serving. Serve gravy on the side.