Authentic Italian Stromboli Recipe

Make the dough. Skip this step if using store-bought pizza dough. In a large bowl or the bowl of a stand-mixer, add the flour, yeast, water, olive oil, sugar, and salt. Mix until a dough starts forming, then keep mixing or kneading onto a floured work surface until the dough is smooth and elastic.
Let raise. Place the dough into a clean bowl greased with olive oil, cover the bowl with plastic wrap and allow to raise until double in size (about 60-90 minutes).
Preheat the oven to 350F (180 C) and line a baking sheet with parchment paper.
Add the fillings. Punch down the dough to release any trapped air. Roll out into a 10 x 16 inches (25 x 40 cm) rectangle. Add the sliced Provolone cheese followed by a layer of Milano salami, Golfetta Salami, and shredded mozzarella cheese. Roll up the bread tucking the borders in as you go, making sure it's sealed tightly or the cheese may come out.
Bake. Brush the bread with the beaten egg and sprinkle with Parmesan or Pecorino cheese, black pepper and red pepper flakes (optional). Use a knife to cut a few slits over the top of the bread. Bake for 20-25 minutes or until the top is golden and the bottom (when lifted) is golden brown. Serve hot!