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With the dough on the peel, spoon the bechamel over the surface and spread it evenly, leaving about an inch of the rim untouched. Sprinkle the surface with the Parmigiano. Distribute the mozzarella and prosciutto over the top. Sprinkle the peas over all.
With quick, jerking motions, slide the pie onto the stone. Broil for 3 to 3 1/2 minutes under gas (somewhat longer with an electric oven), until the top is bubbling and the crust is nicely charred but not burnt.
Using the peel, transfer the pizza to a tray or serving platter. Distribute the mint over the top. Slice and
Meanwhile, put the flour in a medium mixing bowl, add the remaining milk, and whisk into a slurry. Once the butter has been completely incorporated into the hot milk, ladle some of the warm mixture into the cold flour mixture to warm it. Pour the contents of the bowl back into the saucepan and whisk it in. Stir in the salt.
Over medium-low heat, whisk the mixture frequently- to prevent sticking-as it cooks and thickens. The bechamel is done at about 180 degrees F, when it has reached the consistency of a runny sauce or heavy cream. Grate in the nutmeg and allow the sauce to cool to room temperature. It will continue to thicken slightly as it cools. Use the bechamel immediately or cool, cover, and refrigerate for up to 5 days; bring it back to room temperature before using.
Shaping the Disk (Method 2):
Take one ball of the dough and generously flour it, your hands, and the work surface. Then press it down and gently stretch it out to 6 to 8 inches. Supporting the disk with your knuckles toward the outer edge and lifting it above the work surface, keep stretching the dough by rotating it with your knuckles, gently pulling it wider and wider until the disk reaches 10 to 12 inches. Set the disk on a well-floured peel. It is now ready to be topped.
Cover the bowl with plastic wrap or a kitchen towel and allow it to rise at room temperature (about 72 degrees F) for 18 hours or until it has more than doubled. It will take longer in a chilly room and less time in a very warm one.
Flour a work surface and scrape out the dough. Divide it into 4 equal parts and shape them: For each portion, start with the right side of the dough and pull it toward the center; then do the same with the left, then the top, then the bottom. (The order doesn't actually matter; what you want is four folds.) Shape each portion into a round and turn seam side down. Mold the dough into a neat circular mound. The mounds should not be sticky; if they are, dust with more flour.
If you don't intend to use the dough right away, wrap the balls individually in plastic and refrigerate for up to 3 days. Return to room temperature by leaving them out on the counter, covered in a damp cloth, for 2 to 3 hours before needed. Don't freeze the dough, but you can store it in the refrigerator, wrapped in plastic, for up to three days. In effect, when you're set to use it, you have your own ready-made dough.
Yield: Makes 4 balls of dough, enough for 4 pizzas
Cook's Notes: While I'm not picky about the flour--either bread flour or all-purpose is fine--what does concern me is how the dough is handled. Treat it gently so the dough holds its character, its texture. When you get around to shaping the disk for a pie, go easy as you stretch it to allow it to retain a bit of bumpiness (I think of it as blistering), so not all of the gas is smashed out of the fermented dough. I prefer to hold off on shaping the ball until just before topping it. If it's going to sit for a while--more than a couple of minutes--cover it with a damp kitchen towel to prevent it from drying out. I offer you two approaches for shaping. The simpler one, executed completely on the work surface, is slower than the second, where you lift the disk in the air and stretch it by rotating it on your knuckles. Lifting it into the air to shape it is more fun, too.