Buttermilk

When a recipe calls for buttermilk and you dont have any on hand, there are a few ways to make a buttermilk substitute that should work fine in most baking situations, I just wouldnt' suggest drinking it plain!

1 tablespoon lemon juice or vinegar plus enough milk to make 1 cup

OR

1 cup milk plus 1 3/4 tablespoons cream of tartar

OR

1/4 cup buttermilk powder and 1 cup water