Sift the flour into a large mixing bowl, add the salt, and stir to combine. This helps to ensure a smooth and even dough.
Dissolve the yeast in the warm water, then add it to the flour. Pour in the olive oil and begin to mix 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 can 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. In a skillet, sauté them over medium heat with a little olive oil until softened.
Grate the smoked cheese and mozzarella, then mix them together with the sour cream, oregano, and black pepper.
Add the sautéed leek and garlic to the sour cream and cheese mixture. Mix thoroughly to create a creamy, flavorful filling.
Punch down the risen dough on a lightly floured surface. Divide it into 4 equal portions and roll each into a circle.
Evenly distribute the filling over one half of each dough circle, making sure to leave the edges free.
Fold the dough over the filling to form a half-moon shape. Press the edges together to seal, then crimp them with a fork to prevent them from opening during baking.
Place the calzones on a baking sheet lined with parchment paper. Brush them 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 baked calzones rest for a few minutes before serving warm.
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