Preheat your oven to 400°F (200°C). If using store-bought pizza dough, let it rest at room temperature for 10 minutes to make it easier to roll out.
On a lightly floured surface, roll out the pizza dough to about 1/8 inch (3-4 mm) thickness. Shape it into a large circle, then cut it into two equal halves.
Slice the roasted duck breast into thin strips, and thinly slice the onion.
Heat the olive oil in a skillet over medium heat and sauté the onion until caramelized. Add the balsamic vinegar and cook for another 2 minutes.
Combine the sautéed onion with the sliced roasted duck breast, minced garlic, rosemary, salt, and pepper.
Grate the mozzarella cheese and mix it with the Parmesan cheese. Sprinkle over the duck and onion mixture.
Place the filling on one half of the dough, then fold the other half over it. Use a fork to press down the edges to seal the calzone tightly.
In a small bowl, whisk the egg and brush it over the top of the calzone to give it a beautiful golden-brown color.
Place the calzone on a baking sheet lined with parchment paper and bake for 15-18 minutes, or until golden brown.
After baking, let it cool slightly, then drizzle with a little olive oil and serve warm.
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