Most of the time people treat vegetables and fruits as dead beings and handle them in a very insensitive way. Many times they are not touched with clean hands and are stored in a unhygienic places. All this affects the energy of the vegetables.
Vegetables and Fruits are very sensitive and vulnerable to the way they are treated and handled. Proper care is needed to preserve their prana. When we handle vegetables with love and affection then they absorb this love energy and that in turns comes back to us when we eat them. In this existence nothing is accidental, whatsoever we do comes back to us thousand times. So whatever is your emotional or mental state while cooking the food becomes the part of the food.
Energy of the vegetables is very important and it contributes a lot to our physical health as well as mental balance. If the energy of the vegetable is not good then washing it with water helps a lot. So I always wash the vegetables and fruits before using them for any recipe. Just for an example when I peel the outer layer of onion then I wash it with water. Lets take another example. It helps if we wash the eggs before breaking them. Running water has cleansing and purifying effect not only on vegetables but also on human aura. If you want to clean your aura then another good practice is to put few spoons of sea salt in the water bucket and then take bath. Salt water is very good for cleaning the human aura. Thats why going to beach or sea we feel relaxed and cleaned. You can even experiment putting few spoons of salt in the water while mopping the floor.
As a matter of fact its only the vegetables and fruits which absorbs the energies. At microscopic level everything in this world is energy including us and everything interrelates in the form of energy. E.g even the chair on which we sit also absorbs our energy. There are some psychics who can tell about the emotions of a person by just holding his handkerchief or piece of cloth worn by the person or by feeling the chair on which a person has sat for some time and all this without even knowing or meeting the person. The energy absorbing capacity varies for different things. E.g Vegetables, Fruits, Clothes, Gold ornaments are very sensitive and they absorb the energy easily. Whereas few other items are not so sensitive.
Hindus knew about this science very well. Thats why in most of indian temples they make use of marble. As marble is excellent material for absorbing as well as retaining energy for thousands of years. So a spiritual place like temple where everyday many people are going to worship or meditate on their chosen deity is a important place for future generation and its energy level has to be preserved for future generation. Thats why marble despite being expensive building material is used in the construction of the temple and thus many temples retain their vibrancy even after hundreds of years.