DC3 is a hot dog specialty purveyor on 8th St., SE offering hot dogs (and only hot dogs) with elaborate toppings. There is seating.
I easily put this in the DC Top Ten for Cheap Eats.
We sampled three styles, two of them outrageous. The Tuscan Sonora and the Bulgogi/Kimchee were hefty, exotic, and spicy. The hot dogs get an A+ even before the toppings are on.
The Cincinnati Coney was a disappointment with cold shredded cheese on top of indifferent chili, so I would avoid that.
All the hot dogs cost a flat rate of $5 no matter the toppings. One hot dog might make a quick lunch with chips, but you'll need two for dinner.