In a large bowl, combine the flour, dry yeast, and salt. Add the olive oil and lukewarm water, then knead until you have a soft, non-sticky dough. 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.
Finely chop the onion and garlic, then sauté them in a skillet with a little olive oil until softened.
Add the ground meat and cook over medium heat until browned. Season with salt and pepper, then pour in the tomato sauce and sprinkle with oregano and basil.
Simmer the meat ragu for 10-15 minutes over low heat to allow the flavors to meld. Let it cool slightly.
Divide the risen dough into two equal parts, then roll each part into a circle about 5 mm thick.
Spoon the meat ragu onto one half of each dough circle, then sprinkle with grated mozzarella and Parmesan cheese.
Fold the other half of the dough over the filling, and press the edges firmly to seal.
Preheat the oven to 400°F (200°C). Brush the top of each calzone with beaten egg to give it a beautiful golden-brown color.
Place the calzones on a baking sheet lined with parchment paper and bake for 20-25 minutes, or until golden brown.
Let them rest for a few minutes before slicing, so the filling doesn't spill out too hot.
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