My absolute favorite place in Pittsburgh... I eat here as often as possible... the family that runs the place is very kind and delivers the food out to you.
Their burgers are pretty much a carbon copy of what you can get at 5 guys down the street, but slightly cheaper, with a quieter environment and (in my opinion) better fries, which you can get made cajun style... seasoned fries aren't done any better than here.
The peruvian food is also very good, the ceviche was delicious especially for the price: they serve americanized salchipapa for about 4 dollars which is a great fast meal (though pretty bad for you). The chicken is great as well, always well done and seasoned, juicy and delicious, though you are going to want more than a 1/4 bird
A small complaint is that while they do make a chicken sandwich, its actually a piece of white meat served in the style of their hamburger, and not pieces from the rotisserie.