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There's nothing more annoying than buying an entire quart of buttermilk for a recipe that only calls for a small amount. Instead, combine 1 tablespoon of lemon juice or white vinegar, plus enough milk to equal one cup. Stir together and allow to stand for 5 minutes to create “faux buttermilk.” For another option, mix 1 ¾ teaspoon cream of tartar with a cup of milk and let sit for several minutes.