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,
Pan loaf Pan loaf A pan loaf is a style of bread loaf baked in a pan or tin. It is the most common style available in the United Kingdom, though the term itself is predominantly Scottish and Northern Irish so as to differentiate it from the plain loaf. It was once more expensive than the then more common plain loaf. Hence, to speak with a "pan loafy" voice is to speak in a posh or affected manner. The pan loaf has a soft pale brown crust all round the bread, in contrast to a plain loaf's darker crust only at the