Rinse a large mixing bowl in hot water and dry completely to warm it
Dissolve sugar and yeast in warm water in the bowl and let sit until foamy
Add salt, melted butter, and flour to the yeast mixture and mix on low speed for about 3 minutes using the dough hook
Pour olive oil over the dough turning once or twice to coat then cover and let rise in a warm place for about 1 hour or until doubled in size
Punch down the dough and divide it in half
Place one half on a floured surface and roll into a 12x15-inch rectangle then roll tightly from the long side like a jelly roll tapering the ends
Repeat with the second half of the dough
Dust baking sheets with cornmeal and place the loaves on the sheets
Cover and let rise again until doubled in size about 1 hour
Preheat oven to 450°F
Using a serrated knife make diagonal slits across each loaf
Bake for 25 minutes then remove from the oven
Mix egg white and cold water together and brush over the loaves
Return to the oven and bake for 5 minutes longer
Transfer loaves to a wire rack to cool completely