1 1/2 - 2 lbs. hamburger
1/2 onion, chopped
1 box rigatoni noodles
1 (15 oz.) can tomato sauce
1 pkg. pepperoni slices
1 (16 oz.) pkg. Mozzarella cheese

Brown hamburger with chopped onion; drain and set aside.

Cook rigatoni noodles, when done, drain and rinse in cold water.

Add all ingredients together and put in a greased cake pan.

Layer the top with pepperoni slices, then grated cheese. Bake at 350 degrees for 30 to 35 minutes.