I've got to hand it to the folks at Snarf's, they make some of the most delicious sandwiches you can find in Boulder, and Colorado as a whole. They have several different options, including several Vegetarian choices, all of which are additionally customize-able. My favorite is the Pastrami sandwich, and every sandwich I've tried has been fantastic. The bread is perfectly soft, the meat and cheese fresh, and the vegetables and garnish crisp. I couldn't recommend it more. Sometimes there's an occasional wait that can take a little while, but it's absolutely worth it.
Also, as a heads up, the picture listed for this Snarf's is actually for their store in Westminster. I spotted the difference because their store on Pearl Street is a classically Boulder building adorned with Peach-hued stucco and quirky mosaics modeled after the Snarfers on the logo.