Six O'Clock Solution: mezzi rigatoni with sausage

Sausages are a perfect addition when you want a meal-in-one pasta, as Lidia Matticchio Bastianich demonstrates in her latest book, Lidia’s Celebrate Like an Italian (Appetite by Random House, $45).The popular TV cook uses sweet Italian sausages (without fennel seeds, she recommends), but any well-flavoured sausages will do. Crunch is provided by the coarse outer leaves of escarole. Bastianich suggests using the tender inner leaves in a salad. Grated grana padano or Parmesan cheese add