Gently mix with your fingers to form a dough, it will be sticky at that stage. Knead it for 4-5 minutes or until it doesn't stick to your hands anymore.
Turn the dough into a ball and then return it to the bowl.
Cover with a cling film or clean kitchen cloth and then let it rise for an hour or until it doubles the size.
To prepare the filling, place roughly chopped onions, tomatoes, peppers, and chili in a food processor. Gently and quickly blitz the vegetables using the pulse function of the food processor.
Divide the dough into 4 equal pieces and place them on a lightly floured surface. Cover them with cling film or a damp kitchen cloth and then let them rest for another 10 minutes.
Spread ¼ of the mince filling evenly over the dough, leaving a 1 ½ cm border at the edges. Fold the border over the filling and then pinch the top and bottom ends together.
Line 2 large baking trays with baking paper and gently transfer 2 pides on each tray. Cook the sides for 20 minutes, until the filling is cooked and the pastry is lightly browned.