In a large bowl, combine the flour, yeast, and salt. Add the olive oil and lukewarm water, then knead until a soft, but not sticky, dough forms. 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 doubled in size.
Cut the duck breast into smaller pieces. Melt the butter in a skillet over medium heat and sauté the duck pieces for 8-10 minutes.
Pour in the orange juice, grate in the orange zest, add the honey and minced garlic, and cook for another 5-7 minutes, until the sauce thickens and coats the meat.
Season with black pepper and oregano, then let the duck mixture cool slightly.
Divide the risen dough into two equal portions, then roll each out into a circle, about 5 mm thick.
Spoon the orange duck mixture onto one half of each dough circle, then sprinkle with the grated mozzarella and Parmesan cheese.
Fold the other half of the dough over the filling and firmly press the edges to seal, preventing the filling from escaping.
Preheat the oven to 400°F (200°C). Brush the top of the calzone with beaten egg to achieve a beautiful golden-brown color.
Place the calzone 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 piping hot.
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