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Sour milk is milk that has naturally soured due to lactic acid fermentation. This process occurs when bacteria in the milk consume lactose and produce lactic acid, resulting in a thicker texture and tangy flavor. Its appearance can range from slightly thickened to curdled, depending on the extent of the fermentation. It's a versatile ingredient, especially valuable when fresh milk isn't readily available or when a distinct tangy flavor is desired. Explore cooking with sour milk as it can add moisture and a pleasant subtle sour taste to baked goods and other dishes.

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Sour milk is already in a state of spoilage; however, to slow further deterioration (if you intend to use it quickly for cooking), store it in a tightly sealed container in the refrigerator. Use within 2-3 days. Discard if it exhibits an off odor or visible mold.