How to make a buttermilk substitute

A lot of Southern recipes use buttermilk. I don't usually keep buttermilk on hand but here is a simple method for making a substitute.

Mix 1 tablespoon of white vinegar in 1 cup of regular milk. Allow to sit about 1 minute before use. Stir thoroughly prior to adding to your recipe.

I wouldn't recommend drinking it but it works great in cooking.