It all depends, but if we make them on the grill at home then the must haves are cheese, ketchup and LOTS of onions. Optional if I'm in the mood would be mustard, tomato, mayo, lettuce. Do not care too much for bacon on my burger. Please give me crunchy dills on the side, not on it, yuck. Oh, and one of my favorite burgers is Friday's mushroom, onion and swiss. YUMMY!!