There is one particular cheese that springs to mind when talking about fine round holes, and that is Jarlsberg. For 60 years, these famed holes, along with the yellow colour and distinct mature flavour, have spread to make the cheese an international celebrity. Exactly how these holes are made is one of Norway’s best guarded secrets, and so is the original Jarlsberg recipe. Countless family meals across the globe have been spent pondering the mysteries of those perfectly shaped holes. Yet no one has been able to replicate the success of Norway’s most treasured cheese.