Bread unpredictable since the steam is not produced until the bread is baked. Steam leavening happens regardless of the raising agents (baking soda, yeast, baking powder, sour dough, beaten egg white) included in the mix. The leavening agent either contains air bubbles or generates carbon dioxide. The heat vaporises the water from the inner surface of the bubbles within the dough. The steam expands and makes the bread rise. This is the main factor in the rising of bread once it has been put in the oven. CO generation, on its own, is too small to account for the rise. Heat
Afghan bread Afghan bread Afghan bread, or Nân-i Afğânī (Persian: نان افغانی), is the national bread of Afghanistan. The bread is oval or rectangular and baked in a tandoor, a cylindrical oven that is the primary cooking equipment of the sub-continental region. The Afghan version of the tandoor sits above ground and is made of bricks, which are heated to cook the bread. The bread, also known as "naan", is shaped and then stuck to the interior wall of the oven to bake. Black cumin or caraway seeds are often sprinkled on the bread, as much for decoration as for taste, and