of  flour  and  water  and often additional ingredients. Doughs are usually  baked , but in some cuisines breads are steamed (e.g.,  mantou ), fried (e.g.,  puri ), or baked on an unoiled  frying pan  (e.g.,  tortillas ). It may be  leavened  or unleavened (e.g.  matzo ).  Salt ,  fat  and  leavening