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1
Combine the 00 flour, salt, olive oil, and water in a bowl. Mix until a rough dough forms, then knead on an unfloured surface for 8–10 minutes until the dough is smooth and cohesive. Divide into two equal pieces, shape each into a ball, cover with a cloth, and rest at room temperature for 30–40 minutes. The dough is ready when it offers no resistance when pressed with a fingertip.
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2
Heat the oven to its maximum setting — 300°C if the oven allows; otherwise as high as it will reach. Place the baking tray in the oven to heat through. Oil the hot tray generously with olive oil.
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3
Working with the first dough ball, stretch it over the backs of your hands — exactly as you would stretch filo or strudel pastry — easing it gradually from the centre outward until it is translucent in places and large enough to cover the tray with a slight overhang. Lay it onto the oiled tray. This step is where the dish lives or dies: if the dough tears too coarsely or remains too thick, the finished focaccia will be bready rather than cracker-thin; the sheet must be near-transparent before it goes down.
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4
Scatter the crescenza in irregular blobs across the lower sheet, leaving a border of roughly 2 cm at the edges. Do not spread the cheese evenly — uneven distribution creates pockets of molten cheese in the finished focaccia.
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5
Stretch the second dough ball to the same near-transparent thinness. Lay it carefully over the cheese-covered base sheet. Press and pinch the edges together to seal. Trim any excess overhang. Pierce the top sheet at irregular intervals with your fingertips or a small knife to allow steam to escape. Drizzle olive oil over the surface and season lightly with salt.
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6
Slide the tray onto the highest shelf of the oven. If the oven cannot reach 300°C, engage the broiler or grill element simultaneously. Bake until the surface blisters and browns in irregular spots and the cheese is visibly melted and running beneath the top sheet — 8–12 minutes depending on oven temperature. The focaccia is done when the top is deeply blistered, golden in places, and the filling moves when the tray is tilted.
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7
Remove from the oven and serve immediately from the tray. The cheese should run when the focaccia is cut. It does not travel and does not wait.