The Sterns say it's time to forget Buffalo chicken wings. The real reason to head to the western New York State area is 'the best roast beef sandwich in America' - Beef on Weck, a specialty of Buffalo taverns for years. Slices of juicy, rare roast beef and freshly grated horseradish are piled high on 'kummelweck,' an unusual hard roll crusted with pretzel salt and caraway. Beef on Weck is serious stuff in Buffalo. To check it out for yourself go to Schwabl's, a 150-year-old family business, or Charlie the Butcher's Kitchen near the Buffalo airport.