The tortilla soup was not my idea but rather that of one of my mini-tour-mates, Sheena, who requested a more brothy soup versus the tortilla soups of the North that seem to be pureed within an inch of their lives. The tortilla soup was the challenge... so I hit the books. I read a great number of recipes and decided on what I liked and didn't like about each of them. Then, I surveyed Sheena for her "key components."
Last thing, before I get down to business, I think that there is something fundamentally enjoyable about food that comes with all sorts of opportunities to personalize it. This soup is no exception. You can tweak it throughout the cooking process... but you can also tweak it when you go to eat. Any number of different additions - lime wedges, sour cream, guacamole, avocado chunks, cilantro... and so on - could adorn or not adorn that particular portion of soup. It almost seems to make each bowl a new experience... an adventure of sorts. And one with immediate belly-filling satisfaction.