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
Welsh cuisine butter. The dough which is mixed with raisins, sultanas and sometimes currants, is similar to shortbread, meaning they can have the consistency of biscuits when cooked on the griddle, and slightly more like a cake when cooked in the oven. Bara brith is a fruit loaf originating from rural Wales, where they used a mortar and pestle to grind the fresh sweet spices. Historically it was made with yeast and butter, though recently it is likely to be made with bicarbonate of soda and margarine. The fruit included would be dried raisins, currants and candied peel, which would be soaked