In a large bowl, whisk together flour, salt, and instant yeast.
Add warm water and mix until a sticky dough forms. No kneading required.
Drizzle olive oil over the dough and cover the bowl tightly with plastic wrap.
Refrigerate for 12–24 hours for best flavor and texture.
Coat a 9x13-inch baking pan with olive oil. Pour dough into the pan.
Use oiled fingers to stretch and press the dough into the corners.
Cover and let rise at room temperature for 2–4 hours, until puffy.
Preheat oven to 450°F (230°C). Dimple the dough using your fingertips.
Drizzle with olive oil, sprinkle with coarse salt and rosemary.
Bake for 20–25 minutes until golden brown and crisp on the edges.
Cool slightly, slice, and serve warm or at room temperature.