Biker Jim’s cited, but Tenderbelly is best at home.
In a feature called “America’s Best Hot Dogs,” Food & Wine tagged Biker Jim’s — the usual suspect in Colorado for interesting sausages of all sorts. Of this Denver institution that started as a cart on the 16th Street Mall and now has two restaurants (including Coors Field) and five carts, the magazine noted:
Jim Pittenger emphasizes sourcing ingredients as close to home as possible, then veers as far as he can imagine from the ballpark frank: elk and jalapeño cheddar; wild boar; rattlesnake. The franks are spilt, grilled till charred and loaded with Coca-Cola–soaked grilled onions and a drizzle of cream cheese.
For the rest, most seem to have been selected for the amount of stuff piled onto the franks — perhaps to disguise the taste. Not necessary (or desirable) with Denver-born Tenderbelly pork frankfurters, which are so good that they ought to be minimally adorned.
It’s available online via the company’s website.