We love hot dog carts. Seriously, a couple of dirty-water dogs, something salty out of a foil bag and a cold Coke is often the only thing that carries us through the day. But sometimes even the traditional charms of a street-corner vendor are not enough, and that's when we make the trek to the 16th Street Mall for one of Biker Jim's white veal brats, reindeer sausages or spiced bison dogs. Jim is always happy to talk about his gourmet-game product (when he's not working through a long lunch-rush line, that is), as well as his recent foray into the custom-cheesecake business. Some of Denver's finer restaurants are now serving the cheesecakes; you can get a single slice from one of the coolers behind Jim's cart.