Sift the flour into a large mixing bowl, add the salt, and whisk together. This helps to ensure a smooth dough.
Dissolve the yeast in the lukewarm water, then add it to the flour. Pour in the olive oil and begin to combine the dough.
Knead the dough until it is smooth and elastic. If it's sticky, add a little flour, but not too much, as it may dry out the dough.
Place the dough in a lightly oiled bowl, cover, and let it rise for about 1 hour, or until doubled in size.
Slice the leek into thin rings, and finely chop the garlic. Dice the cooked ham into small cubes.
In a skillet, sauté the leek and garlic in a little olive oil over medium heat until softened. Add the ham and sauté for a few more minutes.
Grate the smoked cheese and mozzarella, then mix them together with the sour cream, oregano, and black pepper.
Add the sautéed leek, garlic, and ham to the sour cream and cheese mixture, then mix thoroughly to create a creamy, flavorful filling.
Punch down the risen dough on a floured surface, then divide it into 4 equal parts and roll each into a circle.
Evenly distribute the filling over half of each dough circle, making sure to leave the edges free.
Fold the dough in half to form a half-moon shape, press the edges together to seal, then use a fork to crimp the edges firmly to prevent them from opening during baking.
Place the calzones on a baking sheet lined with parchment paper, then brush with beaten egg to give them a beautiful golden brown color.
Bake in a preheated oven at 400°F (200°C) for about 20-25 minutes, or until golden brown.
Let the finished calzones rest for a few minutes, then serve warm.
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