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Make the dough as in the "Focaccia classica" recipe, oil it and leave to rest for 20 minutes. Then turn the dough over, dimple it and spread the filling over two—thirds of the dough. Fold the short side, covered with the filling, into the center. Fold the other short side (without tilling) over the top. Then fold in the sides in the same way. Press down very gently with your fingertips and flatten out. Handle the dough as carefully as you can, as the filling mixture makes it quite fragile. Turn the dough over and rest for another 20 minutes. Turn it back again and repeat the turning and folding twice more.