Method

Put the flour, salt (if using), yeast, oil and 300ml lukewarm water in a bowl and mix until soft. Knead into a ball (try not to add any extra flour) – it will be sticky but the flour will absorb some moisture. Return to the bowl, cover and leave somewhere warm.

Meanwhile, make the filling. Heat the oil in a large non-stick pan, then stir-fry the peppers for about 1 min until they start to soften. Add the aubergine and garlic and continue to cook over medium heat for 8-10 mins, gently pressing the veg with a wooden spoon until it breaks down a little. If it doesn’t, fry, covered, for a few extra mins.

Stir in the tomato purée, vinegar and 2 tbsp water. When the veg is soft, remove the pan from the heat and stir through the basil.

Heat the oven to 220 ̊C. Quarter the risen dough and roll each piece out to a 20cm circle on a lightly floured surface. Spoon a quarter of the filling over one side, scatter over a quarter of the olives, top with a quarter of the cheese, and brush the edges with the milk or beaten egg. Fold the dough over the filling and pinch the edges together at the side, a bit like making a Cornish pasty. Lift onto a lightly oiled baking sheet and brush with more milk or beaten egg. Repeat with the remaining dough and filling to make four calzones, then bake for 15-20 mins until golden. Leave to cool slightly and serve at room temperature.