01 -
In a large mixing bowl, combine bread flour, warm water, sourdough starter, and kosher salt until well mixed. The dough will have a batter-like consistency. Cover and let it rest for 15 minutes.
02 -
Wet your hand and grab one edge of the dough. Pull it up and over itself. Rotate the bowl 90 degrees and repeat up to 16 times around the bowl. Cover and rest for 15 minutes. Repeat this process 5 more times (6 sets total) every 15 minutes. Alternatively, use a stand mixer with a dough hook for faster kneading.
03 -
Add 2 tablespoons of olive oil to a clean bowl. Transfer the dough to the oiled bowl, ensuring it's coated with oil and not sticking to the sides. Brush some oil on top of the dough. Cover and let it rise at room temperature until doubled, about 4 hours in a 75°F kitchen.
04 -
Line the bottom of your baking pan with parchment paper and oil it with 2 more tablespoons of olive oil. Transfer the dough to the prepared pan. Use your fingers to gently spread it out. If it springs back, let it rest for 10 minutes and try again.
05 -
Cover the dough and let it proof until noticeably puffy, about 2 hours.
06 -
About 20 minutes before baking, preheat the oven to 375°F and adjust the rack to the middle position. Lightly oil your hands and use your fingertips to poke the dough all over to redistribute air bubbles. Drizzle the top with the remaining tablespoon of olive oil. Top with pizza sauce, shredded mozzarella cheese, and toppings of your choice.
07 -
Bake in the preheated oven for 25-30 minutes until golden brown on top. If the cheese starts browning too much before the focaccia is done baking, loosely cover the pan with foil for the last 5-10 minutes of baking. Allow the focaccia pizza to cool in the pan for 10 minutes before removing. Cut into pieces and serve warm.