Ingredients

1 tablespoon cornmeal

6 cups all-purpose flour

2⒈/⒉ .25-ounce packages active dry yeast

1⒈/⒉ teaspoons salt

2 cups warm water (110°F/45°C)

1 egg white

1 tablespoon water

Instructions

Grease a large baking sheet and sprinkle with cornmeal. Set aside.

Combine 2 cups flour, yeast, and salt in the bowl of a stand mixer. Stir in 2 cups warm water; beat with the dough hook attachment until blended. Continue adding remaining flour, a little at a time, until incorporated.

Knead dough on a lightly floured surface until smooth and elastic, 8 to 10 minutes. Shape into a ball, place in a greased bowl, and turn once. Cover and let rise in a warm place until doubled in size, about 1 hour.

Punch dough down and divide in half. Turn out onto a lightly floured surface. Cover and let rest for 10 minutes.

Roll each half into a large rectangle. Roll up, starting from a long side. Moisten edge with water and seal. Taper ends.

Place loaves, seam-side down, on the prepared baking sheet. Lightly beat egg white with 1 tablespoon water and brush over loaves. Cover with a damp cloth and let rise until nearly doubled, 35 to 40 minutes.

Preheat the oven to 375°F/190°C.

Use a sharp knife to make three or four diagonal cuts, about ⒈/⒋-inch deep, across the top of each loaf. Bake in the preheated oven for 20 minutes. Brush loaves with egg white mixture. Continue baking until an instant-read thermometer inserted into the center reads 190°F/88°C or loaves sound hollow when tapped, 15 to 20 minutes more. If necessary, cover loosely with foil to prevent over-browning.

Remove loaves from the baking sheet and cool on a wire rack.