In a large bowl, combine the flour, salt, sugar, and dry yeast. Add the lukewarm water and olive oil. Knead until you have a soft, pliable dough.
Cover the dough and let it rise in a warm place for about 1 hour, or until doubled in size.
Drain the canned tuna and flake it with a fork in a bowl. Mince the garlic finely.
Slice the black olives and mix them with the tuna, tomato sauce, minced garlic, and oregano.
Grate the mozzarella cheese and prepare the filling.
Turn the risen dough out onto a floured surface and divide it into four equal parts. Roll each part into a circle about 3 mm thick.
Spoon the tuna mixture onto one half of each circle, then sprinkle with the grated mozzarella. Leave about 1 cm of space around the edges for folding.
Fold the dough over to create a half-moon shaped calzone. Press the edges firmly together to seal, then press with a fork to ensure they don't open during baking.
Brush the top of each calzone with a beaten egg to achieve a golden-brown color after baking.
Bake in a preheated oven at 400°F (200°C) for about 20 minutes, or until the calzones are golden brown.
Let them cool slightly, then serve fresh, optionally with extra tomato sauce or garnished with a little fresh basil.
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