In a large bowl, dissolve yeast in warm water and let it sit for 5 minutes.
Add the sugar, oil, salt and 2 cups flour and beat until blended. Stir in enough remaining flour to form a stiff dough.
Turn onto a floured surface; knead until smooth and elastic, about 6-8 minutes. Place in a greased bowl, turning once to grease top. Cover and let rise in a warm place until doubled, about 1 hour (I like to put mine in the oven with the light on).
Punch dough down; return to bowl. Cover and let rise for 30 minutes.
Punch dough down. Turn onto a lightly floured surface. Shape into a loafs.
Sprinkle a parchment lined baking sheet with cornmeal; place loafs on baking sheet. Cover and let rise until doubled, about 25 minutes.
Beat egg white and cold water; brush over dough. With a sharp knife, make diagonal slashes 2 in. apart across top of loaf. Bake at 375 degrees for 25-30 minutes or until golden brown. Remove from pan to a wire rack to cool.