Because of the social evolution, our habits and gestures are changing.
The development of technology appeared in our kitchens filling them with machines that are supposed to work for us and save us time and energy for a high quality final product; but a distance between us and the material has been creating. Physical contact is no longer part of our relation with food, we are losing the connection with the food material and its preparation.
Notions such as cleanness and dirtiness have changed in time: why don't we dare anymore to make our hands dirty and experience the preparation of food? Can therefore food be considered dirty?
Three tools to short the distance between our body and the food material, embracing the "dirtiness" and the physical contact, a re-appropriation of gestures we lost.