• In a large bowl: combine flour, salt, yeast and whisk. Add lukewarm water and 2 tbsp olive oil. Use a wooden spoon or spatula and mix everything together (it's going to be wet & sticky). In a separate or same bowl: coat the dough with 2 tbsp olive oil (this will prevent the dough from drying out). Cover with plastic wrap and refrigerate in the refrigerator at least 12 hours or up to 24 hours.
• Remove the bowl from the refrigerator. Gently fold the dough (inwards) a few times (highly recommended). Cover again at room temperature for an additional 30 minutes.
• Coat the baking pan with 2 tbsp olive oil. Remove the dough from the bowl and transfer to the (greased) baking pan. Try your best to spread the dough across the pan to form a rectangle. Cover with a cloth or towel and let sit at room temperature for 3-4 hours.
• Preheat the oven to 425°F.
• Remove the cloth or towel. Pour ½ cup olive oil on top of the dough. Use your fingers to poke dents into the dough (poke all the way down to the baking pan) all over top surface. Sprinkle the top with salt (recommend using Mediterranean Sea Salt) and fresh rosemary leaves.
• Bake in the oven for 25-30 minutes (it took me 25 minutes) or until the edges are golden & crisp. Remove the pan from oven and let cool in the pan for 10 minutes. Then transfer the focaccia to a cooking rack, let rest until cool to touch.

Slice and serve warm.