01 - Preheat oven to 400°F. Slice off the top of the garlic head, drizzle with 1 tablespoon olive oil, wrap in foil, and roast for 30-35 minutes until soft and caramelized. Let cool, then squeeze cloves from skins and mash into a paste.
02 - In a large mixing bowl, combine bread flour, yeast, and fine sea salt. Add lukewarm water and stir until a shaggy dough forms. Fold in the mashed roasted garlic and chopped rosemary until evenly distributed throughout the dough.
03 - Cover the bowl with plastic wrap or a clean kitchen towel. Place in a warm, draft-free area for 1-2 hours until the dough has doubled in size and appears bubbly on the surface.
04 - Turn the dough onto a lightly floured work surface. Shape into a round ball by folding the edges toward the center. Place seam-side down on parchment paper, brush with olive oil, and sprinkle with flaky sea salt and additional rosemary if desired.
05 - While dough rests, place an empty Dutch oven with its lid into the oven. Heat to 450°F for at least 30 minutes to ensure the pot is thoroughly preheated.
06 - Carefully transfer the parchment paper with dough into the preheated Dutch oven. Cover with the lid and bake for 30 minutes to create steam and develop the crust structure.
07 - Remove the lid and continue baking for an additional 12-15 minutes until the crust achieves a deep golden-brown color and the bread sounds hollow when tapped on the bottom.
08 - Lift the bread from the Dutch oven using the parchment paper. Transfer to a wire rack and cool for at least 30 minutes before slicing to allow the crumb to set properly.