Add water gradually. Knead the dough into a ball (if the dough is too stiff add some water).
Knead the dough on a floured working surface until it is smooth and elastic this can be done in an electric mixer fitted with a dough hook, or in a food processor.
Form the dough into a ball and put into a lightly floured bowl, covered with a damp cloth. Leave in a warm place until the dough has doubled in size- about 6 hours.