Diehard burger fiends in the know agree that the best versions of this most American of all meals can be had at U.S. CAFE EXPRESS. Beef burgers available as hearty single combinations (with the usual topping suspects of lettuce, tomato, cheese and bacon) or as hefty, gotta-squash-em doubles deliver pure red-meat gratification. But its the turkey burgers that are unexpectedly supreme. The thick, juicy burgers are as rich as their beef brethren and as satisfying to your meat-craving animal heart, but almost completely fat free. Until you slather them with mayo, that is.