In some recipes, buttermilk provides an acid, usually to activate baking soda for leavening. In those cases you can use a substitute (milk and vinegar or milk and lemon juice). Other recipes call for real buttermilk. It’s usually a bad idea to replace buttermilk with milk.
In some recipes, buttermilk provides an acid, usually to activate baking soda for leavening. In those cases you can use a substitute (milk and vinegar or milk and lemon juice). Other recipes call for real buttermilk. It’s usually a bad idea to replace buttermilk with milk.