Some fats and oils—such as olive, mustard, sesame, coconut, and ghee—carry distinct aroma and taste profiles that define their flavor. Any food cooked with these ingredients will reflect their flavor—which can be desirable or undesirable. On the other end of the spectrum are the neutral oils, such as grapeseed and cottonseed oil, which have no detectable aroma or taste. Use these oils when you do not want the flavor of the fat or oil to affect the final outcome of your recipe.