Merlot it's interesting that two of your links came up with Jimmy Buff's in the text. Two things that always amaze me about the Internet are Google and Wikipedia. I hope the OP will tell us how close we came to finding his/her answer.
I'd be willing to try an Italian hot dog if they promise me the dog doesn't have nitrates, but I suspect that's a promise they wouldn't be able to make. Anyway it's pretty unlikely I'll ever be in NJ.
ETA: found a Mufuletta recipe at What's Cooking America
. Is this it?
Interestingly, I found a topic at City-Data.com started by a member Taurus430 What is the name of the Italian bread with a hole in the middle?
It looks like it's going to be a long quest since that was started in February 2009, three years and still seeking.
Also this question asked and answered at The Fresh Loaf
: "nyone have a recipe to make this bread that was made in some Italian Bakeries back in the 60's in Brooklyn. I'll describe it from memory- Round loaf with hole in the middle. The bread was braided ..." and the reply "Napoletana "CASATIELLO" Lard Bread..."
I guess we could just google on and on and on...