Baking Substitutions — There are a variety of reasons you might need to find a substitute for one of the ingredients in a recipe: availability, allergies and other dietary restrictions, or you just might not care for something.
How to Substitute for Buttermilk from My Fearless Kitchen. Have you ever cooked a recipe that calls for buttermilk? What do you do if you don't have any? Check out this easy trick to substitute for buttermilk.
Substitute for Buttermilk 1 cup milk 1 tablespoon lemon juice or 1 tablespoon vinegar Directions: 1 Combine ingredients and let stand 5 minutes. 2 After 5 minutes, mix together well and use as buttermilk in any recipe!