It's funny, I have been looking for that recipe for a while and completely forgot that my best friend, of 30 years, spent a whole year working for sbarro's.
But when I finally remembered to ask him, he said the same thing, "I can't remember"
But he did remember that there was Romano in the sauce.
So, if nothing else there is the starting point. Not much help though.
And that was almost 20 yrs ago.
But we can still keep searching Mama M.