Usually, just as I am getting close to leaving Mexico, I find some absolutely irresistible treat and have to eat it every single day until I leave.I arrive back in the U.S. a few pounds heavier, wondering how I ever got so carried away. I return to my more or less normal eating habits and more or less normal weight, only to return and discover some new treat across the border.This week, it was apple empanadas.I didn’t know what an empanada was. I thought it was a sort of meat sandwich and not something I’d get excited about. That was ...