In a large bowl, whisk together 2-1/2 cups of the flour, sugar and salt. Make well in the center and add the yeast mixture and olive oil. Stir until dough comes together and forms a ball. Turn out onto a well-floured surface and knead for 5 minutes, adding as much of the remaining 1/4 cup flour as needed. Form into a disk and place in a bowl that has been lightly coated with olive oil. Turn disk over and cover bowl with plastic wrap. Allow to rise in a warm place for 2 hours.