1 cup red-wine vinegar
2 tablespoons packed brown sugar
1/2 teaspoon salt
1/4 teaspoon ground allspice
1 small red onion, halved and very thinly sliced
Burgers:
1 pound 93%-lean ground turkey
2 tablespoons chopped fresh cilantro
1 1/2 teaspoons ground cumin
1/2 teaspoon ground chipotle pepper
1/2 teaspoon salt
1/8 teaspoon ground allspice
1 teaspoon canola oil
4 whole-wheat buns, split
8 teaspoons reduced-fat mayonnaise, divided
To prepare pickled onions: Whisk vinegar, brown sugar, salt and allspice in a medium glass bowl. Microwave on High until the mixture boils, 2 to 3 minutes. (Alternatively, bring the mixture to a boil in a small saucepan on the stove.) Add onions and toss to coat.
To prepare burgers: Preheat grill to high. Place turkey in a medium bowl and gently mix in cilantro, cumin, ground chipotle, salt and allspice until distributed throughout the meat. Form the mixture into 4 patties. Brush with oil.
Grill the burgers until cooked through and no longer pink in the center, 3 to 4 minutes per side. Meanwhile, toast buns on the grill, if desired.
Drain the onions, discarding the marinade. Spread 2 teaspoons mayonnaise on each bun; top with a burger and pickled onions.
