Directions:

1. Prepare the grill for direct grilling over high heat, about 700 F grill grate temperature.
2. Slice red onion into 3/4-inch thick slices. Oil both sides and season with salt. Reserve.
3. Slice pretzel rolls. On dessert plate, pour oil and dip cut sides of each roll to coat evenly. Season oiled side with salt. Reserve.
4. Form ground beef into patties 1-inch larger in diameter than rolls and about 3/4-inch thick. Recess center of patties so when burgers plump, they will turn out flat.
5. Brush each patty on all sides with olive oil and season with salt.
6. Grill onion slices until translucent and soft, about 10 minutes. Remove from grill, break slices down into rings and reserve.
7. Grill beef patties, turning once, 3-4 minutes per side. Flip patties, adding large ring of onion to each patty. Add small ring or two of onion inside larger ring. Add cheese on top of onion.
8. While cheese is melting and bottom of patties are cooking, lightly grill rolls.
9. Gently remove burgers when done and transfer directly onto pretzel rolls. Skewer each burger.