I spoke to my friend, the one who went to Tanzania last year.
Told him about the single solitary cashew nut mixed up in the spice tray. He tells me that he'd actually visited a "Cashew Nut" factory while he was in India (2006).
Apparently shelling cashews is an extremely labour intensive process and the shellers only earn 30p/day.
Here are some photos he took (factory in Goa).
SnS ;D