Method
1)Combine the yeast, 100ml of the 225ml -250ml warm water and sugar. Leave for 5 minutes until the yeast starts to foam.
2)Mix the flour, salt and oil in a large mixing bowl. Using a dough hook for a mixer or the metal blade of the food processor, gradually add the yeast mixture and slowly add the 125ml water. Continue mixing until the dough is smooth and leaves the sides of the mixing bowl.
3)Remove the dough from the processor. Knead it for 2-3 minutes on a surface dusted with flour. Form into a ball. Return the soft dough to a clean, slightly oiled bowl. Cover and leave to rise for 1 hour.
4)Meanwhile make the filling. Place the tomatoes in a bowl and pour over boiling water. Leave for 2-3 minutes. Drain the water away and remove the skins. Cut the tomatoes in half, de seed and roughly chop the flesh.
5)Heat the olive oil in a frying pan. Sauté the onion until just golden. Transfer to a mixing bowl. Add the chopped tomatoes, mozzarella, basil, ricotta, Parmesan cheese and season with salt and freshly ground black pepper.
6)Pre-heat the oven to 240 C/ 475 F/. Gas mark 8.
7)Knock back the dough and divide into 6 balls.
8)Roll each ball into a flat circle about 5 mm/ ¼ inch thick. Use the lid of 20 cm saucepan as a template Spread the pesto sauce or sun dried tomato paste or tapenade on the flat circle leaving a 2 cm border.
9)Divide the filling between the 6 circles of dough, placing it on half of each circle and allowing a border of 2 cm/ 1 inch all around.
10)Fold the other half of the circle over. Crimp the edges of the dough together with your fingers or a fork to seal.
11)Line a baking tray with non stick baking parchment paper. Place the calzone on the tray. Brush the tops with olive oil.
12)Bake for 15- 20 minutes until the tops are golden brown and the dough is puffed up.