Method and apparatus for steam-cooking food products to improve their appearance and decrease yield loss. The capacitor is configured to store electrical energy and to provide the electrical energy to the plasma gun. The resource controller may display information associated with the service commitment time. The lens forming materials is photo-polymerized in the presence of the reactive tinting compound to prepare a tinted contact lens. By means of this arrangement the turbine efficiency is increased and the risk of vane sticking is avoided to a large extent.