In 'Pass the Butterworms', Tim Cahill takes us to the steppes of Mongolia, where he spends weeks on horseback alongside the descendants of Genghis Khan and masters the 'Mongolian death trot'; to the North Pole, where he goes for a pleasure dip in ice-cold water; and to Irian Jaya New Guinea, where he spends a companionable evening with members of one of the last head-hunting tribes. Whether observing family values among the Stone Age Dani people, or sampling delicacies like sauted sago beetle and premasticated tree-root beer, Cahill is a fount of arcane information and a master of self-deprecating humour.