I read somewhere today that Carolina's uses a ton of lard in cooking their tortillas and I say... awesome. Use whatever you have to Carolina's but keep that taste sensation coming.
My normal order, because I can't bear to be at Carolina's and not have this, is the green machaca burro, add potatoes. And it's amazing. Every single flipping time, it's amazing.
I'm really happy I just ate (unfortunately non-Carolina's) or else I would be seriously tempted to abandon work and drive the 8 miles for that burro right now.