As recently as two weeks ago we believed that Vietnam was home to the world's best sandwiches. But no more. We've been torta-fied.  A torta is a Mexican sandwich comprised of any one of a number of fillings nestled between the halves of an oval roll called a bollilo. I've long known of the existence of torta, but never thought to actually try one. To tell the truth, until I caught banh mi fever in Vietnam sandwiches just seemed so pedestrian, so American. If you're going to eat Mexican food, I thought, why eat a sandwich? Then one day last week we were trolling for lunch in Espanola, ... read more