Step 1: Roast the Garlic. Preheat your oven to 400°F (204°C). Carefully cut the whole head of garlic in half horizontally, exposing the cloves. Drizzle the cut sides with a little extra-virgin olive oil, then sprinkle generously with coarse sea salt and freshly ground black pepper. Wrap snugly in foil and roast in the preheated oven for about 40 minutes, or until cloves are soft and golden brown. Let cool, then squeeze or scoop the mashed roasted cloves out of their skins.
Step 2: Mix the Dough. In a small bowl, pour in the room temperature water and sprinkle the active dry yeast over it. Stir gently and let sit for 10-15 minutes until foamy. In a large mixing bowl, combine flour, kosher or fine sea salt, dried oregano, and finely chopped fresh rosemary. Once the yeast mixture is bubbly, add it to the dry ingredients, along with the mashed roasted garlic and the remaining olive oil. Mix with a sturdy spatula until a sticky, shaggy dough forms.
Step 3: First Rise. Cover the bowl with a clean kitchen towel and let the dough rise in a warm spot at room temperature for 8 to 10 hours, or until it has doubled in size.
Step 4: Shape and Cold Ferment. Lightly flour a clean work surface. Gently turn the dough out onto the floured surface and gently shape it into a loose ball. Carefully transfer the dough, seam-side up, into a floured proofing bowl or a regular bowl lined with a floured kitchen towel. Cover and place in the refrigerator for 1 to 24 hours (or up to 48 hours for deeper flavor).
Step 5: Preheat Oven & Score. When ready to bake, place your Dutch oven (with its lid) into your oven and preheat to 450°F (232°C). While heating, remove dough from refrigerator. Invert the dough onto a piece of parchment paper, seam-side down. Using a sharp blade (like a bread lame or razor blade), make one deep score or slash across the top surface of the dough.
Step 6: Bake. Carefully transfer the dough along with the parchment paper into the preheated Dutch oven. Pop the lid on tight and bake for 30 minutes. After 30 minutes, remove the lid and continue baking for another 15 to 20 minutes, or until the loaf is golden brown and sounds hollow when tapped on the bottom.
Step 7: Cool & Slice. Carefully remove the bread from the Dutch oven and transfer it to a wire rack. Let the bread cool completely for at least 1 hour before slicing to allow the internal structure to set. Slice and serve immediately.