From: recipelink.com

Spinach and Tomato Stromboli
Recipe By : Tom Georges

pizza dough for 12 inch pizza
4 cloves garlic
1 red onion
2 cups fresh spinach (whole leaf)
1 vine ripened tomato
2 cups shredded mozzarella cheese
1 Tsp oregano
1 Tsp basil
Spaghetti sauce (for dipping)

This recipe does not include the recipe for the pizza dough. I've made the dough from scratch and used a mix (like Martha White). In my opinion, the choice of dough is not as important as it is with pizza. Just my opinion. So, in terms of the dough, it's your choice. Actually, I prefer the mix, as I get a thinner crust that's less bread-like than when I use dough made from scratch. With that said, on to the preparation of ingredients.

Filling
Peel and slice the garlic into medium slices. If you don't like biting into garlic, you may want to slice it even finer. Slice the red onion (1/8") into one or two slices. More if you really like onion, less if you don't. Quarter the slices. Slice the tomato in the same way. I usually use about four tomato slices. Tear the spinach leaves by hand into smaller pieces. Mix all these up together with the oregano and basil.

Dough
Prepare the dough and stretch onto a pizza pan (non-stick, mesh, pizza stone, etc. Whatever you prefer) as if you're making a pizza. Except make it a bit more oval shaped than round. Preheat oven to 450 degrees.

Combine
Now, sprinkle about 1/2 the cheese onto the dough along the longer axis of the crust. Leave about 1/2" on each end with no cheese. Next, sprinkle the filling onto the cheese. Last, sprinkle the rest of the cheese on top of that.

Now to create the stromboli.
The idea is to wrap the two shorter sides of the dough around the filling to they meet, then press them together. Pinch together the ends to seal it. Try to get the shape to be more or less cylindrical in cross section. I like to form a slight arc, so that everything fits better on the pan. Place in the oven and bake for about 10 minutes. You may want to check at about seven minutes just to make sure that everything's OK. Bake until the crust is a golden brown.

Serve with heated spaghetti sauce for dipping.