sour milk <ref>make sour milk by adding 1 tablespoon vinegar to 1 cup of milk.</ref>
Sour milk retains the calcium and protein content of whole milk while the acidification process may enhance mineral bioavailability. The addition of acid does not significantly alter the macronutrient composition but does increase perceived sourness without substantial caloric additions.
About
Sour milk is milk that has undergone acidification, either through natural souring via lactic acid fermentation or through the deliberate addition of an acid such as vinegar or lemon juice. Historically, sour milk was the inevitable result of milk storage before refrigeration, but modern sour milk is typically prepared intentionally by culinary acid treatment. The acidification process denatures milk proteins and alters the texture and flavor profile, producing a tangy, slightly curdled product with a characteristic sharp taste. Sour milk differs from buttermilk in that buttermilk is the byproduct of butter churning and contains active cultures, whereas sour milk is a simple acid-curdled product with minimal fermentation.
In contemporary cooking, sour milk serves as both an ingredient and a substitute for buttermilk or yogurt in recipes requiring acidic dairy components.
Culinary Uses
Sour milk is employed in baking as a leavening agent when combined with baking soda, which reacts with the lactic acid to produce carbon dioxide. It appears in traditional recipes for pancakes, waffles, biscuits, cakes, and Irish soda bread, particularly in recipes predating commercial buttermilk availability. The acidic nature also tenderizes baked goods and enhances their crumb structure. In some cuisines, sour milk is used in marinades for meat or as a base for salad dressings. It can be used as a substitute for buttermilk or yogurt in most recipes, though the flavor profile may be slightly sharper and less complex than fermented cultured products.