From the Talk forums of Slice parent site Serious Eats, frenzels asks:
I just drove through Delaware for the first time and saw several Grotto Pizza restaurants...my assumption was that the pizza was most likely terrible franchise crap. But just now, I noticed a SE thread in which someone mentioned Grotto Pizza as a must-visit hometown eatery in PA and DE. I realize "must-visit hometown places" are sometimes more prized for the comfort/nostalgia they induce rather than the quality of the actual food. Still, I'm weirdly curious. Thoughts?