In a small glass bowl, combine yeast, warm water and sugar. Let stand for 8 to 10 minutes or until it is bubbly. Meanwhile in the bowl of a food processor, using the cutting blade, combine together the salt, 2 cups flour and cornmeal. Stir the bubbling yeast mixture. With the food processor running slowly add the yeast and the olive oil. Process until well combined and a ball forms, about 1 to 2 minutes. Using the remaining 1/4 cup of flour lightly dust a flat surface, knead the dough for about 2 minutes. Place dough into a lightly oiled bowl and cover with a damp towel. Let dough sit for approximately one hour and fifteen minutes or until it has doubled in size.