The bread is baked on a bed of small river stones in an oven. There are usually two varieties of this bread offered at Iranian bakeries: the generic one which has no toppings; and the more expensive variety which is topped with poppy seeds and/or sesame seeds.
“Sangak” bread was traditionally the bread of the Persian army. It is mentioned for the first time in the 11th century. “Sangak” bread is very useful for children especially for the periods that nervous cells are on the growth. The iron existing in the whole meal bread will cause children to be clever.
Tourist Review| Another classic iranian bread: sangak
And here is my favourite of all Iranian breads, sangak, a large and very thin loaf that is pointed at one end and square at the other mainly because of the way the baker stretches the very wet dough as he lays it on the floor of the oven which is covered with hot pebbles. You often find sangak bakeries attached to restaurants, either dizi or simply kebabs like in this post about such a place in Dubai — there is an important Iranian community in Dubai and as a result great Iranian food. The bakery in my pictures is in Tehran, at the back of a wonderful dizi restaurant where the owner stopped looking at fashion in the late 60’s, early 70’s. He was dressed in a white and black suit with flared trousers and wore a hat. Quite unexpected in a place where everyone looks rather drab (on the street) because the women have to cover their hair and hips and most men are in grey or dark suits./ Source: Anissa Helou