Mix together the flour, half a cup of water, quarter of a cup of oil and one teaspoon of salt in a stand mixer with the dough hook fitted. Beat until you have a soft and sticky dough which should take around five minutes.
Tip the dough out onto a floured surface and knead until it is elastic and smooth which should take a further eight minutes.
Wrap in plastic wrap then leave to rest at room temperature for three hours.
Preheat the oven to 500F and brush a baking tin with oil.
Unwrap the dough and divide into two.
Roll out into a thin dough and lay into the baking tin stretching it over the sides.
Drop the torn cheese on top of the dough in an even layer then top with the second dough.
Press the edges of the two layers of dough together to seal then make a few holes in the top dough to enable steam to escape.
Brush the dough with the remaining oil then sprinkle with sea salt.
Bake in the oven for around 13–14 minutes until the focaccia is golden brown.
Cut into squares and serve.