Combine the lukewarm water, sugar, and yeast in a bowl. Let it stand for 10 minutes until frothy.
In a large bowl, mix together the flour and salt. Add the yeast mixture and half of the olive oil.
Knead until a smooth, elastic dough forms. Cover and let rise for 1 hour, or until doubled in size.
Divide the dough into equal-sized rolls and place them on a baking sheet lined with parchment paper.
Let the rolls rest for another 20 minutes while preheating the oven to 430°F (220°C).
Using your fingers, make small indentations on top of the rolls. Drizzle with olive oil, then sprinkle with rosemary and coarse sea salt.
Bake for 20-25 minutes, or until golden brown and crusty.
Let cool completely on a wire rack before serving fresh or using as a sandwich base.
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