In a large bowl, combine the flour, dry yeast, and salt. Add the olive oil and lukewarm water, then knead until you form a soft, non-sticky dough. If it's too dry, add a little more water.
Cover the dough with a clean kitchen towel and let it rise in a warm place for about an hour, or until it has doubled in size.
While the dough is rising, mince the garlic and roughly chop the arugula. Grate the mozzarella cheese and finely grate the Parmesan cheese.
In a skillet, heat a little olive oil and sauté the minced garlic until fragrant. Add the tomato sauce, basil, oregano, and black pepper. Simmer for 5 minutes to allow the flavors to meld.
Divide the risen dough into two equal portions and roll each out into a circle, about 5 mm thick.
Spoon the tomato sauce onto one half of each dough circle, then sprinkle with arugula, grated mozzarella, and Parmesan cheese. Fold the other half over the filling and press the edges firmly to seal.
Preheat the oven to 400°F (200°C). Brush the top of each calzone with beaten egg for a beautiful golden-brown finish.
Place the calzones on a baking sheet lined with parchment paper and bake for 20-25 minutes, or until golden brown.
Wait a few minutes before slicing, to prevent the filling from spilling out while hot.
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