For the past 38 years, Sarussi has offered the biggest Cuban sandwich in town: fifteen inches long and a good four inches tall. What makes owner Humberto Betancourt such a culinary genius is not mere size, however. It is his top-secret hot sauce. Piquant but not spicy, the peppery condiment gives this full meal of a sandwich a unique flair. Hints of Tabasco, mojo, tomato sauce, and some unidentified salsa reportedly smuggled in from Costa Rica. Intelligence sources say he prepares the sauce in a secure bunker beneath his heavily guarded home. Direct questions about the ingredients are met with icy stares, then mocking laughter. Good try.