In a small bowl, combine the warm water and yeast and stir until it has dissolved completely. Let this mixture sit for 5 minutes until it becomes foamy.
In a large bowl, add the hot water and oil. Stir in the sugar and salt. Add in the yeast mixture and stir until combined.
Gradually add 4 cups of the flour, a cup at a time, stirring constantly with a wooden spoon until all of the flour is absorbed and the dough begins to pull away from the sides of the bowl.
Sprinkle some of the remaining 2 cups of flour onto your work surface and turn the dough out onto it. Knead the dough for 8 to 10 minutes, adding more flour as needed to prevent sticking. The dough should be smooth and elastic when kneaded.
Form the dough into a ball and place it in an oiled bowl. Cover with a damp cloth and let rise in a warm area for 1 hour or until doubled in size.
Once the dough has risen, punch it down and knead it for a few minutes. Divide the dough into three equal pieces, shape them into rectangles, and place them on a greased baking sheet. Cover with a damp cloth and let rise for another 30 minutes.
Preheat the oven to 375 degrees F. Brush the risen loaves with a beaten egg and then sprinkle them with cornmeal. Bake for 25 minutes or until golden brown. Allow to cool before slicing and serving.