Soda bread
Soda bread (Irish: arán sóide, Scots: fardel, Serbian: česnica/чесница) is a variety of quick bread traditionally made in a variety of cuisines in which sodium bicarbonate (otherwise known as baking soda) is used as a leavening agent instead of the more common yeast. The ingredients of traditional soda bread are flour, bread soda, salt, and buttermilk. The buttermilk in the dough contains lactic acid, which reacts with the baking soda to form tiny bubbles of carbon dioxide. Other ingredients can be added such as butter, egg, raisins, or nuts.
Origin
During the early years of European settlement of the Americas, settlers and some groups of Indigenous peoples of the Americas used soda or pearl ash, more commonly known as potash (pot ash) or potassium carbonate, as a leavening agent (the forerunner to baking soda) in quick breads. In the US, soda breads were first publicised by Amelia Simmons as a quick and cheap method of bread making in her book American Cookery, published in 1796. By 1824, The Virginia Housewife by Mary Randolph was published containing a recipe for Soda Cake.