01 -
Mix together ripe sourdough starter, sugar, water and flour until you get a rough dough ball. Let it sit covered somewhere warm for about an hour.
02 -
Work the salt and olive oil into your dough. Use your fingers to pinch and fold the dough until everything's totally mixed in.
03 -
Put your dough in a container with a lid and let it grow in a warm place for about 1.5 hours. Every half hour, stretch and fold it into a square. You can also try coil folding if you prefer.
04 -
Move your dough onto a tray with lots of oil or lined with parchment paper. Let it rest in a warm spot for 3-4 hours until it's bubbly and spreads out naturally. For cake pans, cut the dough in two pieces (500g each) and carefully put them in. You can also keep it in the fridge overnight or up to 3 days with oiled plastic wrap loosely on top.
05 -
Heat your oven to 230°C (450°F) with a baking stone or steel in the middle if you have one. Make deep dimples all over the dough surface by pushing your fingers right through repeatedly.
06 -
Pour plenty of olive oil over the dimpled dough. Scatter coarse salt and rosemary or whatever toppings you like on top.
07 -
Put it in the oven on the stone or steel for about 20 minutes until it's golden and crispy on the bottom. If you don't have a stone, place the focaccia in the lower third of your oven to make sure the bottom gets crispy.
08 -
Take it out and right away add a bit more olive oil on top. Let it cool a little before cutting.