北欧发酵奶

right|thumb|220px| in a glass ' (), also known as ', is a traditional fermented milk product from Sweden, and a common dairy product within most of the Nordic countries. It is made by fermenting cow's milk with a variety of bacteria from the species Lactococcus lactis and Leuconostoc mesenteroides. The bacteria metabolize lactose, the sugar naturally found in milk, into lactic acid, which means people who are lactose intolerant can tolerate it better than other dairy products. The acid gives a sour taste and causes proteins in the milk, mainly casein, to coagulate, thus thickening the final pr