Sesame oil, also known as gingelli oil, carries a premium relative to other cooking oils and is considered more stable than most vegetable oils due to antioxidants in the oil. Sesame oil is least prone, among cooking oils, to turn rancid. This is because it has a very high boiling point. In effect, sesame oil retains its natural structure and does not break down even when heated to a very high temperature.
Sesame oil is most popular in Asia, where its widespread use is similar to that of olive oil in the Mediterranean.
A dash of sesame oil in your stir fries will give them an authentic flavour.