Pour off any fat. Add the zucchini and cook until it's tender. Stir in the sauce. Stir the beef mixture, pasta, 1/2 cup mozzarella cheese, ricotta cheese and Parmesan cheese in a 3-quart shallow ...

Fill in any bare spots with half a sheet of pasta, breaking into ... on top and spoon the remaining Bolognese over that; then cover with a final layer of zucchini and basil leaves.