Not sure if Five Guys is fast food, but it's our favorite. Has gotten too pricey lately to go often, but it's always good. ( I get w cheese, mayo,grilled onions, grilled mushrooms,)
For fast food: I like BK double cheeseburger plain. I agree w the Filet/fish from McD, never a burger there
Several local burger places here, and if I can get one w pimiento cheese, I do.