Put a pizza stone on the bottom rack in the oven and preheat to 500 degrees F for at least 30 minutes. Heat a small skillet over medium heat, add the pancetta or bacon, cook until the fat renders but is short of being crisp, about 5 minutes. Transfer with a slotted spoon to a paper towel-lined plate to drain. Divide the dough into 2 equal portions; form each into a ball. Roll a portion into a 12-inch disk on a floured surface (cover the other piece with a kitchen towel). Lightly dust a pizza peel with flour and put the dough on the peel, drizzle lightly with oil and sprinkle with salt. Slip the dough onto the preheated stone and cook until just set, about 4 minutes. Using the peel, remove the dough from the oven and top with about half the sauce and toppings - pancetta, mozzarella, onion and garlic. Drizzle with a little olive oil. Return the pizza to the stone and cook until the crust is golden and the cheese melts, about 5 to 7 minutes more. Remove the pizza, top with half the grated Parmesan and scatter with some basil leaves and pepper flakes, if desired. Serve. Repeat with the remaining dough and toppings.
Whisk water and sugar in a bowl and scatter the yeast over the top. Set aside until foamy, about 10 minutes. Stir in olive oil. Whisk the flour and salt in a large bowl. Make a well in the center and pour in the yeast mixture. Gradually stir the dry ingredients into the liquid to make a rough, shaggy dough. Turn out onto a lightly-floured work surface and knead until smooth and elastic, about 5 minutes. If the dough seems wet, add just enough flour to prevent sticking. Brush a large bowl with olive oil. Form the dough into a ball, rotate it around the bowl to coat and place it seam-side down in the bowl. Cover the bowl tightly with plastic wrap. Set aside at room temperature, until doubled, about 1 1/2 hours. Or cover and refrigerate overnight. If refrigerating bring to room temperature about 30 minutes before forming. Yield: Makes 1 1/2 pounds of dough, enough for 2 (12 inch) pies
Heat the olive oil in a medium saucepan over medium-high heat. Add the garlic and cook until golden but not dark brown, about 20 seconds. Using your hands, crush the tomatoes and add them to the pot along with 1/2 cup water, basil, and season with salt. Bring to a boil, reduce heat to medium-low and simmer until the sauce thickens, about 15 minutes. Serve.