Mulassano
This tiny café, decorated with marble and finely carved wood panels, is famous for its tramezzini (small triangular sandwiches made with white bread and filled with all sorts of goodies), which they claim to have invented here in the 1920s. Popular with the pre- and post-theater crowd, the café also offers a unique roulette system for clients trying to decide on who pays the bill—ask the cashier for an explanation.