In mixing bowl, combine water, yeast and a few raisins (to feed the yeast). Stir. Cover with plastic wrap and a tea towel. Let sit for about an hour or so. Add white flour, salt and olive oil. Mix well, adding whole wheat flour as needed. Mix until dough is no longer sticky. Place on floured surface. Knead for about 10 minutes. Return to floured bowl. Cover with plastic wrap and tea towel. Let sit for about an hour, or to suit your schedule. Place dough on floured board. Cut into quarters, and form each quarter into a ball. Let balls sit on floured board, covered with plastic wrap, for about half an hour. Heat cast iron skillet to medium. Flatten rounds manually til about 6 inches in diameter. Cook each round for about one minute per side. They will form pockets if the dough is light enough. Serve at once or store in paper bag placed into a plastic bag.
makes 4 rounds.