Where does most of the world 's cheese come from ?
It is so expensive because of its rarity : there are only about 100 jennies in the landrace of Balkan donkeys that are milked for pule - making , each jenny must be hand - milked thrice daily , it takes 25 litres ( 6.6 gallons ) of milk to create one kilogram ( 2.2 pounds ) of cheese , and the cheese is then smoked .