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My grill.

Fast food:
Whataburger still beats In-and-Out, 5 Guys, Mooyah, etc. to me.

Fast casual:
Smashburger
Fuddrucker's (Revisited recently after the burger-joint explosion in the area. Still holds up well. Maybe it got a few more points because we'd spent all day at the water park with four kids, but man, it hit the spot.)

Specialty:
Love Shack. (Try the Dirty Love Burger with the fried quail egg. I do mustard only for sauce, though.)

Maybe it's nostalgia:
Denton County Independent Hamburger Company

Still to try:
Fred's