I loved Tabatchnik's. Not only the hot dogs but their Sloppy Joes and other sandwiches. A very good kosher dog from Empire National (not Empire Kosher), 1/3 pound, grilled, and $2.95. http://www.empirenational.info/
Marc Bruno sent me a follow up message where he confirmed that the 5/1 natural casing dog is the same recipe as the skinless 6/1 dog that is the South Philly dog. He also mentioned that Aramark will continue to explore other options for hot dogs.
"We'll continue to research and test different options with our culinary development team and I'll let you know if a change to the dog arises in the future."
Let me suggest to anyone affiliated with any hot dog establishment in Pennsylvania, New York, or New Jersey that the Hatfield deli beef frank is a top quality frank with a unique flavor. There are quite a few hot dog carts and trucks in Central and North Jersey serving this particular dog. And a few brick and mortar places as well. The Rahway Grill, Mazzi Dogs, and Curbside Cafe are 3 of the most popular.
Hopefully Philly will get their own. Maybe even Citizens Bank Park some day.