Sift the flour into a large mixing bowl, add the salt, and mix. This helps to achieve a consistent dough texture.
Dissolve the yeast in the lukewarm water, then add it to the flour. Pour in the olive oil as well, and start to combine 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 may dry out the dough.
In a lightly oiled bowl, cover and let rise for about 1 hour, or until doubled in size.
Slice the eggplant, zucchini, and bell pepper into thin slices. Grill them in a skillet with a little olive oil over medium heat until slightly browned.
Finely chop the garlic and add it to the tomato sauce along with the oregano. Mix well.
Punch down the risen dough on a floured surface. Divide it into 4 equal parts and roll each into a circle.
Thinly spread the tomato sauce on half of each dough circle, being careful to leave the edges free.
Place the grated mozzarella on top of the tomato sauce base, then evenly distribute the grilled vegetables on top.
Fold the dough in half, press down the edges, and then use a fork to firmly crimp them together to prevent them from opening during baking.
Place the calzones on a baking sheet lined with parchment paper, then 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, then serve warm.
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