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1
Combine flour, salt, yeast, water, and oil in a large bowl. Mix with hands or a wooden spoon until no dry flour remains. (The bowl should be at least 4 to 6 times the volume of the dough to account for rising.)
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2
Cover bowl tightly with plastic wrap, making sure that the edges are well sealed, then let rest at cool room temperature (no warmer than 75u00b0F) for at least 8 hours and up to 24. Dough should rise dramatically and fill bowl. In a hot kitchen, the dough may overproof near the end of that range.
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3
Sprinkle top of dough lightly with flour, then transfer it to a well-floured work surface. Divide dough into 2 pieces and form each into a ball by holding it with well-floured hands and tucking the dough underneath itself, rotating it until it forms a tight ball.
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4
Pour 1 to 2 tablespoons oil in the bottom of two 10-inch cast iron skillets or round cake pans (see note). Place 1 ball of dough in each pan and turn to coat evenly with oil. Using a flat palm, press dough around the pan, flattening it slightly and spreading oil around the entire bottom and edges of the pan. Cover tightly with plastic wrap and let dough sit at room temperature for 2 hours (at room temperatures above 75u00b0F, the dough may require less time to rise; at temperatures below 65u00b0F/18u00b0C deg;F, it may require more time). After the first hour, adjust an oven rack to the middle position and preheat oven to 550u00b0F (290u00b0C).
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5
After 2 hours, dough should be mostly filling the pan up to the edges. Use your fingertips to press it around until it fills in every corner, popping any large bubbles that appear. Lift up one edge of the dough to let any air bubbles underneath escape, then repeat, moving around the dough until there are no air bubbles left underneath and the dough is evenly spread around the pan.
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6
Top each round of dough with 3/4 cup sauce, spreading sauce to the very edge with the back of a spoon. Sprinkle evenly with mozzarella cheese, all the way to the edges. Season with salt. Add other toppings as desired. Drizzle with olive oil and scatter a few basil leaves over the top of each pizza, if desired.
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7
Transfer pan to oven and bake until top is golden brown and bubbly and bottom is golden brown and crisp when you lift it with a thin spatula, 12 to 15 minutes. Immediately sprinkle with grated Parmesan or Pecorino Romano cheese, if using. Using a thin spatula, loosen pizza and peek underneath. If bottom is not as crisp as desired, place pan over a burner and cook on medium heat, moving the pan around to cook evenly until it is crisp, 1 to 3 minutes. Remove the pizzas and transfer to a cutting board. Cut each pizza into 6 slices and serve immediately.
