surmælk
Surmælk is a term used in Nordic countries, particularly in Denmark, to refer to soured milk. It is a traditional dairy product made by allowing milk to ferment, typically through the action of lactic acid bacteria. This fermentation process results in a thicker consistency and a characteristic tangy flavor. Surmælk can be made from various types of milk, including whole milk, skimmed milk, or even buttermilk.
Historically, surmælk was a common way to preserve milk before refrigeration was widely available. The acidity