Sourdough focaccia
1 tray (30 × 40 cm) · about 2.1 kg · 4 × 6 inDough
7 ⅓ cups bread flour
1.76 lb water
7 oz active levain (100% hydration)
0.75 oz fine salt
1.5 oz extra virgin olive oil
Tray and Bake
2 oz extra virgin olive oil, for the tray and top
0.25 oz flaky salt
0.25 oz rosemary leaves