Mix flour, yeast, warm water, salt and olive oil to form a soft dough.
Knead the dough until smooth and elastic.
Cover and let it rise until doubled in size.
Transfer the dough to an olive-oil-greased baking tray and gently stretch it.
Make deep dimples across the surface with your fingertips.
Drizzle with olive oil and sprinkle with rosemary and sea salt.
Bake until golden brown and crispy on top.
Cool slightly, slice and serve.