Sparky's is tucked away on N. 5th St, and is easy to miss if you aren't really looking for it. They offer organic beef burgers and soy burgers, and the same with hot dogs. Their best deal is the Burger Box, featuring various burgers or hot dogs with crispy fries for about $6. Personally, I love their cheese fries. Instead of american or mozarella cheese, they use a sharper cheese that gives an edge to their super-crispy fries.
They also make a great lemonade/iced-tea, although I'm pretty sure it's made from a powder. The atmosphere is "rustic," and the music is sometimes a tad too ...industrial.