In order to boost sales, Reblochon, a soft cow's milk cheese, created tartiflette in the 1980s; it’s made of potatoes, bacon, onion, and of course, Reblochon. The snag is that Reblochon is not available in the United States because it is only aged for 50 days, falling short of FDA guidelines, so potential tartiflette-makers have to get creative.