Activate Yeast:
In a small bowl, combine warm water, sugar, and yeast. Stir and let sit for 5–10 minutes until foamy.
Make the Dough:
In a large mixing bowl, combine flour and salt. Add yeast mixture and 1/4 cup olive oil. Mix until a sticky dough forms.
Knead the Dough:
Transfer dough to a lightly floured surface. Knead for 8–10 minutes until smooth and elastic. Alternatively, use a stand mixer with a dough hook.
First Rise:
Place dough in a lightly oiled bowl, cover with a clean kitchen towel or plastic wrap, and let rise in a warm place for 1–2 hours, until doubled in size.
Prepare the Pan:
Generously oil a 9x13-inch or similar baking pan. Transfer the risen dough to the pan and gently press it to fit.
Second Rise and Dimple:
Cover and let the dough rise for another 20–30 minutes. Press fingertips into the dough to create dimples all over the surface.
Add Toppings:
Drizzle with olive oil, sprinkle with coarse sea salt, and add rosemary evenly over the top.
Bake:
Preheat oven to 425°F (220°C). Bake for 20–25 minutes until golden brown.
Cool and Serve:
Let cool slightly before slicing. Serve warm or at room temperature.