In a large bowl, combine the flour and salt. Create a well in the center and add the starter and water. Drizzle in 2 tablespoons of olive oil. Mix by hand or with a spoon until a shaggy dough forms.
½ cup active starter, 2 teaspoons kosher salt, 1 ¾ cup water, 3 tablespoons extra-virgin olive oil, 4 cups bread flour
Cover the dough with a damp towel and let it rest for 30 minutes.
Then, perform a stretch and fold every 30 minutes for the next 2 hours: Grab one edge of the dough, stretch it upward, and fold it over itself. Rotate the bowl and repeat 3 more times.
After the final fold, cover the bowl and let the dough rise at room temperature for 8–12 hours, or until doubled in size and bubbly.
Generously oil a 9×13-inch baking pan (that fits in your air fryer basket) with 1 tablespoon of olive oil. Transfer the dough to the pan and gently stretch it toward the corners. Cover and let it rise for another 3–4 hours, until visibly puffy and airy.
Drizzle the top of the dough with olive oil. With oiled fingers, press deep dimples all over the surface.
Bake in the air fryer at 450°F (230°C) for 12-15 minutes, or until the focaccia is golden brown and crisp on top.
While still warm, brush with a bit more olive oil, and sprinkle generously with flaky sea salt and fresh rosemary.
Flaky sea salt and fresh Romero