In genetics, it's known that environmental stress breeds both diversity and specialization. Same thing goes for food. And since there's almost no environment in the lower 48 more harsh than that of Buffalo, New York, in the winter, it shouldn't come as any surprise that Buffalo boasts a wide range of regional cuisine (chicken wings, pizza, beef on weck, etc.) and a sense of specialization that makes its particular iterations on American classic foods the best. Witness the Sahlen's hot dogs and Weber mustard served at the Old Fashioned, one of Denver's very few exemplars of authentic Buffalo cuisine. Go ahead and order two dogs -- one with onions and hot sauce, the other with a generous shot of Weber's finest -- and think warm thoughts.