Knead all ingredients into the dough and let it ferment for 12-18 hours at room temperature. After that, knead the dough and put in the refrigerator for 2 hours. After 2 hours, remove the dough to room temperature to warm up for about 30 minutes. Spread the dough on a baking tray with your hand, oil abundantly with olive oil and press with your fingers. Sprinkle with rosemary or any other spice.
This is a basic recipe that you can use for various fillings - tomatoes/grapes/fennel/onions - however you like. We sprinkled our baked focaccia with dried tomatoes in oil.