- Sour cream is a dairy product obtained by fermenting a regular cream with certain kinds of lactic acid bacteria.
- The bacterial culture, which is introduced either deliberately of naturally, sour and thickens the cream.
Clabber is a food produced by allowing unpasteurized milk to turn sour at a specific humidity and temperature. Over time, the milk thickens or curdles into a yogurt-like substance with a strong, sour flavor.