Makes 1 focaccia of 30 x 20 cm • Prep: 15 min • Resting: 14 h • Oven: 30 min
Put the flour, yeast and salt in a mixing bowl. Using a spatula, stir through the water and 2 tablespoons of olive oil until you get a sticky dough.
Cover the bowl with cling film and put in the fridge for 12 hours.
After 12 hours, grease a 30 x 20 cm baking tin with olive oil and line the bottom with baking paper.
Take the dough out of the fridge and, with oiled hands, pull the dough out of the bowl and into the tin. Pat the dough down and gently pull to flatten it slightly – don’t worry if it doesn’t cover the entire tin as it will expand in the second rise.
Cover the tin with cling film and leave to rise for 2 hours at room temperature.
Shortly before the 2 hours are up, preheat the oven to 220°C top/bottom heat.
Remove the cling film from the tin, drizzle 1 tablespoon of olive oil over the surface and push holes into the entire surface of the dough with wettened fingers.
Sprinkle the surface with fleur de sel and bake in the preheated oven for 30 minutes.
Let the focaccia cool in the tin for 5 minutes, then transfer it to a wire rack. Serve warm or cold.