After the first bite of the reuben dog a few weeks ago, I have become an instant fan and supporter of the Dapper Dog cart, located in NoLibs at 2nd on Poplar. They are only open on Fridays and Saturdays from 9:30 to 2:30ish, but that is prime time for what they are serving.
Back to that reuben dog - think of the best hot dog you've ever had, grilled on a flat top then topped with saurkraut, pastrami and russian dressing. Good. God. I'm sure the extra beers I had that night helped things, but that was probably the best dog I've ever had. The reuben was the special that night, but they also have some staples on the menu that I am looking forward to checking out soon.
Coney Island -
The Mack -