Place the water, sugar and yeast into the bowl of a stand mixer and stir. Allow to activate for between 5-10 minutes until creamy and foamy.
Mixing on low speed, add in the flour, olive oil and salt.
Increase the speed to medium and mix for around five minutes until the dough is pulling away from the sides of the bowl.
Add a little extra flour if the dough is too wet.
Grease a mixing bowl and place the dough into the bowl.
Cover with cling film and place somewhere warm to rise for around an hour and until doubled in size.
Turn the dough out onto a lightly floured surface and roll out into a rectangle of around half an inch in thickness.
Cover with a damp towel and allow to rest for 20 minutes during which it will continue to rise.
Preheat the oven to 400f.
Grease and line a 9 x 13 inch baking tray.
Place the dough into the tray and make deep dents across the surface of the loaf.
Place sprigs of fresh rosemary into each dent.
Drizzle with olive oil and sprinkle with the sea salt.
Bake for 20 minutes until the top is golden and the dough is coked through.
Serve drizzled with more olive oil.