In a large bowl combine ground beef, salts and pepper. Mix well, cover and refrigerate. On second day mix again. Refrigerate. On third day mix again. Refrigerate. On fourth day shape into 5 rolls, about 1-1/2" X 10" Spray broiler rack with Pam. Lay rolls on rack, place on lower oven rack. Cook at 150°F for 8 to 10 hours.