Steam tender green beans with the waterless cooking method. Watch this cooking video below to learn how to steam green beans using the steam control valve. Start cooking with the steam control valve in the “Open” position. When the whistle sounds, it is time to turn down the heat below the boiling point. The green beans turn out tender and delicious. The special waterless lid creates a vapor seal that is tight. Steamed cooked meals keep in the vitamins and nutrients.