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Mixing and storing the dough: Whisk together the flour, yeast, salt, and sweetener in a 5- to 6 quart bowl, or a lidded (not airtight) food container.
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Add the water and mix with a spoon or a heavy-duty stand mixer fitted with the paddle.
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Cover (not airtight), and rest at room temperature until the dough rises, about 2 hours.
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The dough can be used immediately after rising, though it’s easier to handle when cold. Refrigerate in a lidded (not airtight) container and use over the next 10 days. Or freeze for up to 4 weeks in 1-pound portions and thaw in the refrigerator overnight before use.
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On baking day: Dust the surface of the dough with rice flour, pull off a ½ -pound (orange-size)
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piece, and place it on a pizza peel prepared with cornmeal (use plenty) or parchment paper.
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Gently press and pat it into a log-shape with tapered ends, using wet fingers to smooth the surface. Allow to rest for about 40 minutes, loosely covered with plastic wrap or a roomy overturned bowl. During this time, the dough may not seem to rise much, which is normal.
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Preheat a baking stone near the middle of the oven to 450°F (20 to 30 minutes), with an empty metal broiler tray on any shelf that won’t interfere with rising bread.
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Brush the top with egg white wash, and then slash, about ½-inch deep, with a wet serrated bread knife.
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Slide the loaf onto the hot stone. Pour 1 cup of hot tap water into the broiler tray, and quickly close the oven door. Bake for about 35 minutes, or until richly browned and firm.
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Allow to cool completely on a rack before eating.