Preheat oven to 400F.

Cook ziti to al dente in pot and drain.

While ziti is cooking, finely chop onion. Brown the onion and ground beef in large saucepan on medium high heat.

Add pasta sauce to the beef and onion and simmer for 10-15 minutes to make Bolognese sauce

Oil the bottom and sides of the baking dish

In large bowl or ziti pot, combine pasta, Bolognese, ricotta, 6 oz of shredded mozzarella, and 2 oz of pecorrino or parmesan and mix well

Pour contents into baking pan/casserole dish

Cover with remaining mozzarella and parmesan or pecorrino.

Bake uncovered for 25-30 minutes.