Kashk

Yogurt is made by fermenting lactose (milk sugar). In the past, for the first time, they came across this white and thick substance by chance. In ancient times, milk was poured into goatskin bags to carry milk. Bacteria in the skin fermented milk lactose and yogurt was obtained. This bacterium converts lactose into lactic acid and gives it a jelly-like state. The sour and spicy taste you feel in yogurt is due to the presence of lactic acid in it.