I don't suppose anyone has ever used one of these? I expect it wouldn't get hot enough to be of any real benefit to cooking but it's a nice idea.

http://www.amazon.co.uk/Weston-Mill-Pottery-Terracotta-Tandoori/dp/B0047P6KI0/ref=sr_1_1?ie=UTF8&qid=1296561471&sr=8-1

I wonder what sort of customers bought this pot?..........

Take a look at the bit after the technical Details, It says, "Customers Who Bought This Item Also Bought, Official Borat Mankini Thong" LOL  ;D

It's a bold claim to suggest that this pot will reach the temperature of a tandoor when placed in a conventional oven.

Boots used to ( I don't know if they still do?) sell these in the 1990s.  As I understood it then, and as I understand it now, they are primarily for marinating and slow cooking stuff in (like any other unglazed earthenware pot which absorbs flavours into the ceramic walls).  They are not intended to replicate a tandoor.

However, if you wrapped it up in firewool and put charcoal (and an air vent) in the bottom.....?