Combine flour, yeast, salt, and sugar in a large bowl. Add lukewarm water and mix until a sticky dough forms. Rub with olive oil, cover, and refrigerate for 18-24 hours.
Preheat oven to 220°C. Grease a 10"x12" pan with parchment paper. Transfer dough to the pan, coat with olive oil, and let it rise for 2-4 hours.
Sprinkle dough with rosemary, sea salt, and remaining olive oil. Dimple dough with fingers.
Bake at 220°C for 25-30 minutes until golden brown. Let rest 5 minutes before slicing.
Notes
For a crisper crust, bake for an additional 5 minutes. Serve warm with olive oil or your favorite dip.