Hi all, I found following article: Shades of Green Cooking green vegetables: why sous vide is better http://www.popsci.com/diy/article/2009-01/shades-green .... In conclusion, it seems clear that cooking your green vegetables sous vide for short periods of time in boiling water is a much more efficient cooking method than blanching the same vegetables in boiling water. When cooking sous vide, the pot of boiling water can remain covered to avoid evaporation and retain temperature, the water can be reused, and the minerals and nutrients are preserved in the bag along with the vegetable's flavor. satimis