Peppermint tea is a delicious beverage made from fresh or dried leaves infused into a cup of hot or boiling water. Peppermint oil is the essential oil extracted from the peppermint plant that is often used in aromatherapy, while peppermint extract is peppermint oil diluted with alcohol. Both peppermint oil (food-grade) and extract can be used to add flavor to foods and beverages.