Also, scientists at the Hong Kong Polytechnic University have been able to build a nano-thin layer of particles of titanium dioxide, a substance that reacts with sunlight to break down dirt and other organic material.

FORBES: Nanotechnology's Disruptive Future

They built a thin layer, or "nanostructure, " using minute particles of titanium dioxide, a substance that reacts with sunlight to break down dirt and other organic material and can be coated on cotton to keep the fabric clean.

CNN: Washing no longer dirty work

Whether diners dig into the dirt or not, it does take the idea of organic to a whole new level.

CNN: Tokyo restaurant dishes up the dirt