Runner beans are a type of green bean that grows on a climbing vine. They have long, slender pods that can grow up to several inches in length. As the pods mature, they turn a deep shade of red. Runner beans are often considered an old-fashioned or rustic bean, as they were traditionally grown in gardens and fields rather than in commercial agriculture. They are a popular vegetable in many countries and can be cooked in a variety of ways, such as boiled, steamed, or stir-fried.