Knead dough on lightly floured surface with lightly floured hands (reflour hands when dough becomes too sticky) until smooth, soft, and elastic, about 8 minutes. Form dough into a ball, put on a lightly floured surface, and generously dust with flour. Loosely cover with plastic wrap and let rise in a warm draft-free place until doubled in bulk, about 1 1/4 hours. Dust a wooden peel or a large baking sheet (without sides) with cornmeal.