Making buttermilk at home is actually quite simple. Here's how:
Ingredients:
1 cup of milk (whole, 2%, or skim)
1 tablespoon of lemon juice or white vinegar
Instructions:
Pour the milk into a measuring cup.
Add 1 tablespoon of lemon juice or white vinegar to the milk.
Stir the milk and lemon juice/vinegar mixture together.
Let the mixture sit for 5-10 minutes. During this time, the acid in the lemon juice or vinegar will cause the milk to curdle and thicken slightly.
After 5-10 minutes, your buttermilk is ready to use!
Note: If you need more buttermilk, simply increase the amount of milk and lemon juice/vinegar proportionally. For example, if you need 2 cups of buttermilk, use 2 cups of milk and 2 tablespoons of lemon juice or vinegar