Reblochon cheese was created in the 13th century in the valley of Thônes, France. The farmers had to pay the landowners a tax proportional to the milk they produced. To reduce the tax they decided to reduce the milking. Milk taken from cows after a milking has been missed is richer and it is this that gives Reblochon its unique flavour. You can make this recipe with other cheeses, but for an authentic tartiflette it has to be Reblochon.