Tarragon is widely used as an herb in cooking but also has a medicinal history of use. The ancient Greeks chewed tarragon to treat toothaches because of its ability to numb the mouth. Tarragon has also been used as a digestive aid, a mild sedative, and as a heart disease prevention aid. Tarragon is an herb which has a flavor that resembles licorice. It was used during the Middle Ages as an antidote for poisonous snakebites.