Europeans love NYC, but is the city also becoming more European? The French infatuation with Brooklyn is well-documented, and now the city has its second mustard-only boutique in the Flatiron District. 

French brand Maille launched its first mustard boutique on the Upper West Side in December 2014, which is being joined on April 25 by its new flagship store La Maison Maille at 927 Broadway and 21st Street. 

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New at the larger location are 10 additional Dijon-focused varieties to the original store's 25, including the on-point addition of beet, carrot and provencal olive-flavored mustards to pair with spring's crudite platters. There are also vinegars, including one made from Bordeaux dessert wine, as well as cornichons, oils and kitchen tools.

When the first boutique opened, staffed by the world's first-ever mustard sommelier Pierette Huttner, she told us that “in French cuisine, mustard is the secret ingredient" — including a fig-based one she uses on a sweet tart. Beginning May 11, she'll reveal more of her secrets at bimonthly Create Your Own Mustard classes, where participants will infuse one of the on-tap mustards with seasonal ingredients while learning about mustard's history and cultural uses. The one-hour class will cost $59 and alternate between the two locations.

All of which begs the question: Is ketchup over?