Traditional stromboli recipes use homemade pizza dough that has been filled with Italian sausage, pepperoni, ham, sliced red and white onions and black olives, along with provolone and mozzarella cheese for body.
Traditionalists insist on using homemade pizza dough, which adds considerably to prep time. A compromise solution is to use fresh dough prepared at the grocery store. If fresh dough isn’t available, frozen may be substituted.
Roll the out pizza dough on a lightly floured surface into a rectangle and brush with olive oil. Lay out the ingredients over half the dough and cover with the remaining half and roll. Grease a baking sheet and place the dough on it.
While traditional recipes call for sautéing the vegetables and meats first, for around 5 to 10 minutes, others call for leaving the ingredients raw or drizzling them with olive oil prior to baking so the contents steam during preparation.
Roll the stromboli and seal it with egg wash (one whole beaten egg) and bake in an oven preheated to 375 degrees Fahrenheit until golden brown and slightly crispy, which usually takes about 20 minutes. Let the stromboli rest for about ten minutes before cutting it into thick slices and serving.