Italian culture is famous the world over for its art, history and architecture - but food is integral to an Italian's identity. Here, Silvia explores how to make the three meals that have become national treasures. She cooks the 1,000-year-old recipe for pasta amatriciana, plus a seafood dish of mussels, rice, and potato from the Puglia region that is largely unknown to the outside world. Lastly, she makes her version of Neapolitan pizza - a pizza dish so cherished its recipe is protected by the European Union and the United Nations.