Somewhat similar to a calzone, the American stromboli is a savory type of turnover filled with classic pizza ingredients: mozzarella or other types of cheese, Italian meats like salami, pepperoni, bresaola, and capocollo, and sometimes even vegetables, while the marinara sauce is served on the side, rather than baked inside with the filling.
The dough can be either Italian bread dough or standard pizza dough, and before baking, the finished product is rolled into a loaf, similar to that of a jellyroll. Unlike calzone, stromboli did not originate from Italy, but supposedly from suburban Philadelphia where it was invented in the 1950s and named after one of Roberto Rossellini's movies.