Sift the flour into a large mixing bowl, add the salt, and stir to combine. This ensures the dough has an even consistency.
Dissolve the yeast in the lukewarm water, then add it to the flour. Pour in the olive oil and begin to bring the dough together.
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.
Finely chop the onion and sauté in a little olive oil in a skillet until translucent. Add the ground beef and cook over medium heat, stirring constantly, until the beef is cooked through and starting to brown.
Add the crushed garlic, smoked paprika, oregano, and black pepper, and cook for a few more minutes, allowing the flavors to meld.
Punch down the risen dough on a lightly floured surface, divide it into 4 equal portions, and roll each portion into a circle.
Thinly spread tomato sauce over half of each dough circle, leaving the edges free.
Spoon the seasoned ground beef over the tomato sauce, then sprinkle with grated mozzarella.
Fold the dough over to form a half-moon shape. Press the edges together to seal, then use a fork to crimp the edges tightly to prevent them from opening during baking.
Place the calzones on a baking sheet lined with parchment paper. Brush the tops 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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