⅔ cup (150 g) active starter (bubbly, active, fed)
1 ⅓ cups (315 g) warm water (90°F)
1 ½ tablespoons (18 g) olive oil
3 ⅔ cups (450 g) bread flour
2 teaspoons (13 g) table salt
Oil for greasing pan
Additional flour for dusting work surface
Method
Mixing the Dough:
In a large mixing bowl, combine sourdough starter, water, and olive oil. Stir until combined.
Add bread flour and sprinkle salt over the top. Stir together using clean hands or a wooden spoon until mostly combined (dough will be shaggy).
Cover the bowl with plastic wrap and let sit undisturbed for 1 hour (autolyse period).
Stretch & Fold:
Form the dough into a ball with your hands. Wet hands with cool water to prevent sticking.
Grasp the top of the dough, stretch it, and fold it over the bottom. Rotate 90 degrees and repeat four times.
Cover and let rest in a warm place for 30 minutes. Repeat this step every 30 minutes during the rise (approximately 4-6 hours, or until the dough increases in size by 80%).
Forming the Dough:
Lightly grease a 9×5 loaf pan with olive oil or butter.
Turn the dough out onto a lightly floured surface. Deflate gently and shape it into a rectangle.
Fold the right side into the center, then fold the left side over the first fold (like closing a book).
Roll tightly from the skinny end, tuck the ends under, and transfer to the prepared pan.
Cover with plastic wrap and refrigerate overnight for 12-24 hours.
Baking the Bread:
Remove the dough from the refrigerator and preheat the oven to 450°F. Let the dough rest for 30-35 minutes while the oven heats.
Uncover the dough and score a clean ¼" deep slice down the center with a sharp knife or bread lame.
Cover the loaf pan with another 9×5 pan or tent with aluminum foil to create a makeshift oven.
Bake on the center rack for 30 minutes. Remove the cover and bake for an additional 20-23 minutes, until golden brown and the internal temperature reaches 206-208°F (97°C).
Cool the bread in the pan for 15 minutes, then gently transfer to a cooling rack. Let cool completely (1-2 hours) before slicing.