1/4 lb. Mozzarella cheese (not sliced)
1 lb. lean ground beef
1 egg
1/4 c. seasoned bread crumbs
1/2 c. tomato sauce
1/4 tsp. salt
1/2 tsp. oregano
Pepper
1 sm. onion, minced
4 paper thin slices boiled ham

Grate cheese and set aside. Combine beef, egg, bread crumbs, tomato sauce, salt, pepper and oregano. Saute onions in vegetable oil until golden brown; add to meat mixture and mix well. Turn out on sheet of foil and flatten into oblong shape, about 1-inch thick. Place ham slices on top, keeping them about 1 inch from edge. Sprinkle grated cheese on ham. Use foil to fold meat mixture over ham and cheese, closing all openings. Turn loaf from foil into a greased loaf pan (8 x 5 x 3-inch). Pat with fingers to fill corners of pan and shape loaf. Bake at 325 degrees for 60 to 75 minutes, depending on degree of rareness desired.