Potato Sformato with Mortadella and Buffalo Mozzarella
This sformato—an irresistible mashed-potato gratin—isn't on the menu at Anacleto and Tina Bleve's Bottega del Vino is Rome's Jewish Quarter. (The specialty there os involtini— cold cuts and cured fish rolled around endless combinations of fillings.) You have to know to ask for it.
Slideshow: Delicious, Quick Side Dishes