Preheat your oven to 400° F. And line a a rimmed sheet pan with parchment paper allowing the paper to extend over the long sides of the pan. Lightly flour the paper and roll the dough into a large rectangle approximately 10 by 15 inches.
Spread some of the Italian pizza sauce in a thin layer over the Stromboli dough leaving a 1/2 inch border on the ends and a 1 inch on one of the longer sides and a 2-inch border on the other side. Pour the remaining sauce in a bowl for dipping
Top with pepperoni, ham or salami and the other toppings of your choice. Evenly top with with the shredded Mozzarella cheese.
In a small bowl whisk the egg and water together and brush the outer edges of the Stromboli dough with the egg wash. Starting from the long side where you left the 1-inch border, use the parchment paper to roll the dough about 1/2 of the way. Grab the other side of the parchment paper and roll to fold it completely over. Make sure your seam is sealed by the egg wash, you can do this by pressing gently together.
Then gently roll so the seam is on the bottom, tuck in the ends so the egg wash seals both ends. Brush the entire Stromboli with egg wash and make diagonal slits for venting.
Using the parchment paper, position the Stromboli in the center of the sheet pan.
Place the sheet pan with the Stromboli in the preheated oven and bake for 12-15 minutes.
Remove from oven and sprinkle with parmesan cheese and allow to cool for 5 minutes before slicing into 1 to 2-inch slices.
Serve your Italian Stromboli with extra pizza sauce on the side for dipping and with a salad.