Preparation process

1. Prepare the dough by combining all the ingredients except the oil in a bowl and kneading it thoroughly. Cover the bowl with a cloth and leave the dough to rise for at least 1 hour.
2. After the first rise, knead a little oil into the dough, then cover the bowl once again and leave it in a cool place for a few hours, preferably overnight.
3. Before preparing the focaccia, bring the dough to room temperature, then spread it out on a baking tray coated with oil. Brush the top of the dough with oil and sprinkle on chopped rosemary and coarse salt.
4. Bake the focaccia for 20 to 30 minutes in an oven preheated to 250°C.
5. Once done, leave to cool slightly and then build the sandwich in the colours of the Italian flag. Cut the focaccia through the middle and spread the pesto on the bottom half. Place the lettuce on top of the pesto, followed by the mozzarella and tomato, and finally the slices of Poli. Cover with the other half of the focaccia, cut into sandwiches of any size you like, and serve.