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