the flour into a well. place the yeast, salt and warm water in the center. be careful not to let the salt come in contact with the yeast. knead the dough vigorously with your hands for 15-20 minutes, or in a mixer, until the dough is soft and smooth.
once you have the right consistency, adding a bit of water or flour if necessary, shape the dough into a ball. cover with a plastic bowl so that the dough is protected from the air. let rise for 3 or 4 hours at room temperature for about an hour in a warm place.
once the dough will be doubled in volume, separate into 