What is it? Fritas, Cubanos, medianoches and pan con lechón sandwiches: South Florida eaters are well-versed in these staples of handheld Cuban comfort food. But what about the Elena Ruz? Named for a 1930s debutante from Havana, this sandwich hits sweet and savory notes from roasted turkey, cream cheese and strawberry jam on medionoche egg bread. It’s sticky and messy and tastes a little bit like Thanksgiving leftovers.