I am putting the burritos in Mill Valley up to the test and seeing which one reigns supreme. Some may argue I am not a real burrito connoisseur, as I have a very simple order consisting of rice, beans, cheese, and guacamole.

Sprinting out of the car, slamming the doors, and leaving the windows open, my friends book it to the day’s choice of lunch. Whether it is Rocco’s, Joe’s Taco Lounge, Harmony, or Mill Valley Market,...