I've never actually had a pie from either place but I've seen pics and read info on it before and I think it's done with cheddar, either yellow or white, around the rim of the crust. In contact with the pan it will fry up real good and the heavy amount of oil from cheddar will run down into the crust or along the wall of the pan to the bottom. Again, I'm not certain that's how it's done, but it may be worth a try for you.
Loo