Source: http://grubstreet.com/2014/12/maille...

This past weekend, venerated, centuries-old French mustard brand Mailleopened its first stand-alone boutique in the U.S., on Manhattan's Upper West Side. Maille currently operates similar showrooms in Paris, London, and of course in Dijon, so make no mistake: This is a permanent affair, not a pop-up, and it's stocked accordingly. Other than classic cornichons, the Maille shop carries a wide-range of flavors in jars and pours mustard on tap, "filled by hand" in stoneware jars, up to 18.6 ounces. There are more than twenty varieties — morel, Cognac, and black truffle among them. And the whole thing is overseen by Pierette Huttner, who holds the title of "Mustard Sommelier" — a job that has us very intrigued. Grub talked to Huttner to see just exactly what the gig entails.