In some of the recipes here on the blog as well as others, when the recipe calls for buttermilk, if you do not keep this on hand, you can make your own “sour milk” by adding 1 teas vinegar to 1 cup of milk and allowing that to sit for about 15 min, stirring ever few minutes. The vinegar “sours” the milk allowing it to be used in place of the butter milk.
I do not keep buttermilk on hand. I buy the can of dried buttermilk and store it in the fridge. That way, you always are able to have it when needed. Just follow the directions on the can for the amount you need. This keeps several months and it is so easy to use.
Chocolate Castles 