RE: Chicken Shacks
Mr. Boo's is excellent. Their story is that they use a pepper they found growing wild on some land they own in Louisiana, which they harvest just to use at their restaurant. They are using their family name (Bouglea) to identify the pepper and are otherwise very secretive about it. All I know is it has a flavor that I like a lot.
Poverty Pete has also reported very favorably on the hot chicken at the Lorrie Morgan/Sammy Kershaw place, which goes by the name of hotchicken.com, or some such. Maybe he can chime in with some thoughts on preparation. And to answer your question in general, yes - all these places (Prince's, Mr. Boo's, Boltons, hotchicken.com) in Nashville are very protective of their methods. I do believe from what I have observed that Prince's fries in huge iron skillets, while I believe Mr. Boo's deep fries. I have heard that Prince's has a way of getting the pepper into the oil, but I do not know their secret for achieving that or even if that is true. Best answer I can give is to go, observe, taste and try to figure it out. All I know is, it's good!