Boil 1 box of Manicotti or big shell noodles following directions on box. Stuff noodles with meat mixture. Lay stuffed noodles in a 9 x 13 pan. Combine tomato sauce, tomato paste, oregano, sugar and pepper and warm though. Pour over noodles. Lay Mozzarella cheese slices on top. Bake in oven for 30 to 45 minutes at 350 degrees.