Purple Mustard is a hot dog stand that threw open its doors on Mar 2 with options such as The Coney Dog ($9) and Curry My Flava ($8). If you're wondering about the name, it's a homage to their very own homemade purple mustard; made with whole grain and Dijon mustard, as well as Jim Beam-soaked blueberries (yes, really), hence the color. Try some of that namesake purple stuff on the Barnyard Dog, with a beef-Guiness sausage, sriracha remoulade and caramelized onions ($9) or as an accompaniment for some fries (from $3.50).