Quick bread leavening agents include a weak base, such as baking soda (sodium bicarbonate) plus a weak acid, such as cream of tartar, lemon juice, or cultured buttermilk, to create an acid–base reaction that releases carbon dioxide. (Quick bread leavened specifically with baking soda is often called "soda bread".) Baking powder contains both an acid and a base in dry powdered form, and simply needs a liquid medium in which to react. Other alternative leavening agents are egg whites mechanically beaten to form stiff peaks, as in the case of many waffle recipes, or steam, in the case of cream puffs. Nevertheless,
Crempog The mixture is meant to stand for a few hours. A second mixture is made using sugar, bicarbonate of soda, vinegar and beaten eggs. The mixtures are then combined to make a smooth, dense batter. The batter is poured onto a hot bakestone or griddle, over a moderate heat. The "crempog" is cooked until golden on both sides and served in a stack with butter spread on each pancake. In Anglesey and Caernarfonshire "crempogau" were prepared as "crempog furum", a pancake made with yeast, or "crempug wen" where the normally coarse flour was replaced with refined flour. These pancakes were