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,
Stoneground flour credited with significant health benefits. In the USA flour only has to 'pass between stones' once during its manufacture to be regarded as stoneground, and it has been claimed that a significant proportion of flour sold as stoneground in the USA has not been processed in this way, being ordinary roller-ground wholemeal. Stoneground flour Stoneground flour is a wholemeal flour produced by the traditional process of grinding grain between two millstones, in contrast to mass produced flours which are generally produced using rollers. The process leaves the wheatgerm more intact than roller processes for producing wholemeal flour, the larger pieces