distilled white vinegar
crushed red pepper
kosher salt and black pepper
ground chuck (85 percent lean or less)
canola oil, for the grill
brioche buns, split
ricotta salata or Feta, thinly sliced
- In a bowl, combine the vinegar and sugar with the crushed red pepper and 1 teaspoon salt. With a vegetable peeler, cut the zucchini into ribbons; add to the vinegar mixture and let stand 10 minutes.
- Meanwhile, heat grill to medium-high. Form the beef into four ¾-inch-thick patties. Use your fingers to make a shallow well in the top of each patty. (This will prevent overplumping during cooking.) Season with a total of ½ teaspoon each salt and pepper.
- Oil the grill and cook the patties with the wells facing up for 4 to 5 minutes. Flip and cook until an instant-read thermometer inserted in the center registers 155° F for medium, 4 to 5 minutes more. Form sandwiches with the buns, radicchio, burgers, ricotta salata, and pickled zucchini.