For the dough, combine the flour, yeast, salt, and sugar in a large bowl. Add the warm water and olive oil, and knead until you have a smooth, elastic dough.
Cover the dough with a clean kitchen towel and let it rise for 1 hour, or until doubled in size.
Meanwhile, prepare the filling: chop the tomatoes, crush the garlic, and mix them with the tomato puree, oregano, and basil.
Preheat the oven to 430°F (220°C).
Divide the risen dough into two equal parts. Roll each part into a circle approximately 10 inches (25 cm) in diameter.
On one half of each circle, spread the tomato filling and sprinkle with grated mozzarella. Fold the other half over the filling and press the edges to seal well.
Brush the top of each calzone with beaten egg and place them on a baking sheet lined with parchment paper.
Bake in the preheated oven for 15-20 minutes, or until golden brown.
Let cool for a few minutes, then serve garnished with fresh basil.
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