I Need Some Buttermilk Fast! Help!!!!

What do you do if you need buttermilk and you don't have any on hand?

You can make some sour milk. Simply place 1 tablespoon of lemon juice or vinegar in a measuring cup, add enough milk to make a cup. Let the milk mixture stand for at least 5 minutes before adding it to your recipe. One cup of sour milk equals 1 cup of buttermilk.