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âA.C., New York, New YorkThere are a number of substitutes for buttermilk in baking. For each cup of buttermilk, you can use 1 tablespoon of white vinegar or lemon juice plus enough milk to measure 1 cup.
add a comment |. up vote 3 down vote. If you have a buttercream recipe that calls for milk, substitute it with water, and if it calls for butter substitute it with shortening. Shortening is generally kept on the shelf, so it doesn't need to be refrigerated.