We've driven past this place hundreds of times. The place always looked deserted from Broadway so I figured it couldn't last. In those brief glimpses from the car, I never saw anybody going in or out.
But no. It's stood while other restaurants have come and gone. Finally, the curiosity was too much to bear.
I went, I ate, and I lived to tell the tale.
Mustard's Last Stand is a fine spot to grab a quick bite. There was even a line... which used to be unheard of in Boulder. Turns out that it's a popular spot. And a good location too with nearby offices of Wild Oats and Boulder County/City Government, among others.
The dogs were juicy (I ordered a jumbo) and the fries... might qualify as the best in Boulder. At the end of the day, it's still fast food - but for what you get, it's a good deal.
There's a lot more than hot-dogs on the menu including burgers, desserts, etc. Next time I'll take-out and sit by Boulder Creek instead. The interior/seating was crowded and a little dingy.