I've eaten at many a Whataburger and one thing that has always amazed me are the onions, they're the same no matter where I've eaten, not to hot or sweet, just right.
The other thing is they know how a real burger is supposed to come...….. WITH MUSTARD!!!! No silly mayo or ketchup on the burger unless you request it, then they take you out back, beat the hell out of you because you've just exposed yourself as a yankee. And yankees are what they make the burgers out of...….80/20 ground yankee.
They sell their condiments in HEB and I am surprised they haven't started selling frozen patties from Whataburger. And they do have Whataburger Mayo for the northern part of the state where all them imported yankees are hiding out.
I am hoping for them to start their own sliders.