Ghee is a type of clarified butter that is heated and reduced. Its an important ingredient to know if you are cooking for someone who is lactose intolerant. It can last for months, unrefrigerated, though you would want to try and use it up within 9 months which shouldnt be hard, since you can substitute it for butter or any cooking oil on a 1: 1 ratio. And because its kept at room temperature, its always softened and spreadable, great for last minute baking urges and for having on hand in the pantry.
