Pour the water into the mixing bowl and stir in the dry yeast so it starts to dissolve.
Add the flour, sea salt, and EVOO to the bowl and mix until well incorporated. Then cover the bowl with plastic film and let it rest for 30 minutes at room temperature.
After resting, lightly oil your hands with EVOO. Gently lift the dough from the bottom, stretch it, and fold it onto itself. Rotate the bowl 90 degrees and repeat the folding three more times, totaling four folds. Cover again with plastic film and rest for another 30 minutes.
On a workbench, stretch and fold the dough from top to bottom, bottom to top, left to the right, right to the left to give it structure. Shape the dough into a ball, lifting it gently.
Grease the bowl with EVOO, ensuring the sides are coated. Place the dough back and turn it to coat evenly with oil. Again, Cover with plastic film and ferment in the fridge for at least 8 hours. If you can last, up to 24-hour will mean an even better result.
Once fermented, line your casserole dish with EVOO, making sure it is spread all over.
Place the dough in the dish. Slowly stretch the dough with your fingers and make sure the dough fits across the entire base.
Using the tips of all your fingers, gently press down on the dough to poke holes from bottom to top.
Sprinkle raw sugar, then tear rosemary leaves and scatter them over the top. Then put the grapes on top, pressing them in gently.
Finally, the magic touch, drizzle with EVOO and let rest for 30 minutes at room temperature.
Preheat the oven to 210°C (410°F), then once the dough has rested, give it a final poke with oiled fingers before baking it in the oven for 15 minutes at 210°C (410°F).