Make the dough

• Dissolve the yeast in the lukewarm water.
• Mix the flour and salt in a bowl, pour in the yeast water and olive oil and knead into a smooth dough.
• Cover and let rise until doubled in size.

Prepare the filling

• Season the tomato passata with oregano.
• Drain and tear the mozzarella and slice the ham.

Shape and fill

• Divide the dough into portions and roll each into a round on a floured surface.
• Spread tomato passata on one half, top with mozzarella, ham and parmesan.
• Fold the dough over and seal the edges well.

Bake

• Place the calzones on a baking tray and brush with olive oil.
• Bake until golden and puffed.