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To make the biga: Weigh your flour; or measure it by gently spooning it into a cup, then sweeping off any excess. Stir the water, flour, and yeast together, cover, and let rest at room temperature for 12 to 16 hours.
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To make the dough: Add the water to the biga, mixing to incorporate the two.
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Combine the flour, yeast, and salt in a separate bowl, and add to the biga-water mixture. Mix on low speed of a stand mixer fitted with a dough hook until the dough becomes cohesive, about 2 minutes. Increase the mixer to medium speed and knead to form an elastic, sticky dough, about 3 to 4 minutes. Resist the urge to add more flour unless the dough is truly "soupy."
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Cover the dough in the bowl, let it rise for 1 hour, then gently deflate it. Let it rise another hour, then turn it out onto a liberally floured work surface, and sprinkle lots of flour on top.
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Flatten the dough into a 7” x 14” rectangle and cut it into two pieces, each 3 ½” x 14".
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Lightly grease and dust with flour the wells of a ciabatta baker. Carefully transfer the loaves from the work surface to the baker. Cover with the lid, and let the loaves rise until they're very puffy, 1 1/2 to 2 hours.
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About 30 minutes before the loaves are ready to bake, preheat the oven to 500°F with a rack in the middle.
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To bake the ciabatta: Place the baker on the middle rack, lower the oven temperature to 425°F, and bake the loaves for 15 minutes with the cover on, and then another 10 to 15 minutes with the cover off, until they’re golden brown.
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Remove the ciabattas from the baker and place them on the oven's middle rack, crack the door open about 2", and allow ciabatta to cool completely in the turned-off oven.
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Storage information: Store ciabatta, well wrapped, at room temperature for several days; freeze for longer storage.