Buttermilk is primarily due to lactic acid produced by lactic acid bacteria while fermenting lactose, the primary sugar in milk. As the bacteria produce lactic acid, the pH of the milk decreases and casein, the primary milk protein, precipitates, causing the curdling or clabbering of milk. This process makes buttermilk thicker than plain milk. While both traditional and cultured buttermilk contain lactic acid, traditional buttermilk tends to be less viscous, whereas cultured buttermilk is more viscous. Buttermilk can be drunk straight, and it can also be used in cooking. Soda bread is a bread in which the acid in buttermilk reacts
Crumpet If differentiated from the crumpet, a pikelet is defined as containing no yeast as a raising agent and as being cooked without a ring, making it rather flatter or thinner than a crumpet, and a thinner batter was also used. In Stoke-on-Trent, pikelets were once sold in the town's many oatcake shops. A 1932 recipe for Staffordshire pikelets specifies that they were made with flour and buttermilk, with bicarbonate of soda as a raising agent, and suggests cooking them using bacon fat. The term "pikelet" is used in Australian and New Zealand cuisine for a similarly flat cake, of the