In a large bowl, whisk together the flour, salt, and yeast. 1 cup (120 g) all-purpose flour ½ teaspoon fine sea salt ½ teaspoon instant yeast
Add the water. Using a rubber spatula, stir until the water is incorporated and a wet, sticky dough is formed. ½ cup (120 ml) lukewarm water
Cover the bowl with a damp towel (or plastic wrap) and set aside in a warm, draft free place to rise for 1 to 1 ½ hours, until the dough has doubled in size.
Line a 8 ½” x 4 ½” loaf pan with parchment paper or grease with nonstick cooking spray. Pour 1 teaspoon of the oil into the loaf pan. Scrape the dough into the loaf pan and turn to coat in the oil.
Drizzle on the remaining 2 teaspoons of oil. With lightly greased hands, press down on the dough to dimple and stretch the dough outward into the corners of the pan. It's ok if it doesn't stretch to the corners. Cover and let rise for 1 to 1 1/2 hours until noticeably puffy, bubbly, and larger in size. 3 teaspoons olive oil
Nearing the end of the second rise, sprinkle on the rosemary and salt. Dimple the dough again to gently stretch the dough and allow the toppings to sink in. 1 teaspoon minced fresh rosemary Pinch of kosher salt
Preheat the oven to 425℉ (220℃) and position a rack in the center of the oven.
Bake for 20 minutes until golden on top and crisp on the bottom. Remove the pan from the oven and transfer to a wire rack. Let cool for 10 minutes then remove from the pan and cut into squares.