In a bowl, mix warm water, sugar, and yeast. Let it sit for 5 minutes until foamy.
Add flour, salt, and olive oil to the yeast mixture. Stir until a sticky dough forms.
Transfer dough to a greased bowl, cover, and let it rise for 1 hour until doubled in size.
Grease a baking sheet and spread the dough evenly. Let it rest for another 30 minutes.
Use your fingers to create dimples in the dough, then drizzle with olive oil and sprinkle with sea salt and rosemary.
Bake at 400°F (200°C) for 20-25 minutes until golden brown.
Let it cool slightly before slicing. Enjoy warm or at room temperature!