How to Make It
Heat a grill pan over medium-high. Coat pan with cooking spray. Add broccoli rabe; cook 5 minutes, turning occasionally. Coarsely chop. Combine vinegar, oil, and sugar in a small bowl. Add broccoli rabe; toss.
Combine beef, paprika, Worcestershire, salt, and pepper in a bowl. Shape into 8 (3-inch-wide) patties.
Return pan to medium-high. Coat pan with cooking spray. Add patties to pan; cook 2 to 3 minutes. Turn; cook 1 to 2 minutes. Top patties with cheese; cover and cook 1 minute or until cheese melts.
Place 1 patty on bottom half of each bun; top with tomato, broccoli rabe mixture, and top halves of buns.