Tim Tam's are made from 2 thin biscuits with a layer of chocolate between them and then coated all over with chocolate. Best served with a cup of coffee as a Tim Tam Slam. I sent a couple of packs once to a friend in America. She described them as chocolate cocaine
. Be aware though that apparently in the USA there are knockoffs made in Malaya, or thereabouts, not the original Aussie Arnott's and don't taste anywhere near as good.