If you have a Geoclense Home Harmonizer plugged in the house, we recommend that you put the vegetables on a plate before cooking. This is because the Geoclense will neutralize gas and electric frequencies during the cooking process which may dominate the vegetables with an undesirable positive charge. If you do not have a Geoclense Home Harmonizer plugged in, we suggest that you cook the food and then place it on the Rejuvenation Plate. This is because, without the Geoclense, the electric and gas cooktops and ovens do have an ability to lower the frequency of food as it is being cooked.