Test Kitchen video tip: Buttermilk substitutions
Old-fashioned buttermilk was the liquid left over after churning cream into butter. Today, it's commercially made by adding bacteria cultures to milk, thickening the milk and giving it that tangy flavor.
If you have a recipe that calls for buttermilk but don't have any on hand, you can improvise. Whisk 1 cup of milk with a tablespoon of lemon juice or vinegar (cider or white) and set the mixture aside for several minutes until it begins to curdle. Then use as needed.
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-- Noelle Carter
Video credit: Myung Chun / Los Angeles Times