Before you begin to cook vegetables, whether in the steamer or pressure cooker, it is essential to clean them thoroughly. Rinse the vegetables under running water. Wherever possible, avoid peeling off the skins, to retain maximum nutrients. And when eating peels, it is imperative to thoroughly scrub vegetables, especially root vegetables and spuds.
It is important that you cook the vegetables for as little time as you can to preserve nutrition. Although there are many different methods for cooking vegetables, I personally like the pressure cooker method as it is fast and also retains nutrition.