When our most recent baking experiment called for buttermilk we were unsure of what to do. We like to use actual ingredients, but it seemed silly to buy an entire jug of buttermilk! Instead of spending the money and sacrificing the fridge space we decided to use a trick that my mom often employs. Make buttermilk from nonfat milk.
This is an incredibly easy process. Just take 1 T of white vinegar or lemon juice place in a liquid measuring cup add milk to the 1 c fill line.

Let the combination sit for 5 minutes.
Presto Change-o Buttermilk!
What is your favorite kitchen trick?