Reshape the dough into a ball and cut in half, forming 2 balls. (From here on, use olive oil if you're cooking on baking sheets, flour if on a pizza stone.) Put them on a lightly floured surface (a pizza peel is ideal), sprinkle with flour and cover with plastic wrap; or brush then with a bit of oil and place on a lightly oiled sheet. Let rest for about 20 minutes, while you heat the oven to 500 degrees.
04Press a dough ball into a 1/2-inch-thick flat round, adding flour or oil to the work surface as necessary. Press or roll the dough until it's as thin as you can make it; let it rest a bit if it becomes too elastic. (Patience is your friend here.) You can do two baking sheets at once, or one after another, as you'll have to if using a peel. If doing the latter, slide the dough from the peel onto the stone.05Sprinkle the pizzas with olive oil (just a little), salt and rosemary. Bake for at least 10 minutes, perhaps rotating once, until the crust is crisp. Serve hot, warm or at room temperature.