They say that Pule cheese tastes like both Manchego and Feta cheese at the same time. Moreover, it’s very healthy. But that’s not what makes it so expensive — it is the limited availability that creates its high price. Pule is made from the milk of Balkan donkeys — an endangered species that only lives in one place in the world — in the Zasavica Nature Reserve in Serbia. There are about 100 animals in the herd, each donkey is milked by hand, and it gives about 300 ml of milk per milking. 2.2 pounds of this delicacy requires 6.5 gallons of milk. The cheese is available exclusively by order.