I always avoided recipes that had buttermilk in them because I thought buttermilk was too expensive. But then I learned a quick way to make my own buttermilk using 2 simple ingredients I always have on hand. Milk and vinegar. So although this method is.
Any milk that has been pasteurized and cold stored should have Calcium Chloride (CaCl) added. The reason for this is because the calcium originally in the milk slowly becomes soluble and cannot be used to form a firm curd.