A method of regulating the temperature of a cooking liquid during sous vide cooking in a cooking vessel on a burner of a cooktop includes setting a desired cooking temperature and measuring the temperature of the cooking liquid inside the sous vide cooking vessel at a plurality of predetermined time intervals with a first temperature sensor mounted on an interior surface of a wall of the sous vide cooking vessel . The temperature of the cooking liquid is compared to the desired cooking temperature at each of the predetermined time intervals . The energy output of the burner is controlled based on the difference between the temperature of the cooking liquid and the desired cooking temperature . A cooking vessel and system for sous vide cooking using this method are also disclosed .