Check out the Biscuit Bike Story here http://www.seriouseats.com/2010/11/street-food-profiles-biscuit-bike-in-portland-oregon.html
What is special or different about Biscuit Bike in Portland's eclectic and extensive street food scene? Biscuit Bike combines many very Portland elements: food carts, bicycles, vegan food, and Kombucha. And while there's a small but growing number of bicycle food carts in Portland, Biscuit Bike is unique in its ability to provide both hot food and cold beverages on tap. Also, we accept credit cards via an iPhone app and card swiper—that's something I've always wanted to see more food carts offer.
Is it hard to ride your bike uphill? It can definitely be a challenge, especially when the Kombucha kegs and the propane tank are full! But I've been looking into options for an electric motor to increase my mobile capabilities.