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Just did a lil research and Sonny's came right up. Guess I was wrong on the filling. Lots of recipes out there but they all tend to use pulled pork and coleslaw. Sonny's apparently uses jack cheese. Sounds great. Thinkin' ya gonna have to get a spy workin' at Sonny's to get the recipe. Look forward to it if you pull it off and share with us ha.
I have a spy that I am gonna try to connect with. After I posted the question I found the same recipe you mentioned with slaw/jack cheese and pulled pork. I was gonna delete the post, but thought maybe someone had it figured out already.
I'll tell ya, if ever a spy was needed it would be to acquire Shakey's Pizza sauce and dough recipes. I've researched it and found clones but the original real deal...oh MAN ! My first job was at Shakey's back in 1980. Best pie ever !