I guess soapnuts don't have much to do with food, but more about green living and helping the environment. However, you can wash your food in the soapnuts liquid to get rid of the pesticides.
Soapnuts are the shell of a tree grown in India or Nepal. They contain saponin, which is a natural substance that acts as a detergent when it comes in contact with water. No chemicals, dyes, fragrances, surfectants etc to irritate your skin. They are even great on cloth diapers!!!
Check it out: www.BuySoapNuts.com