Tart, tangy, and sweet, pickled red onions and Chinese hoisin sauce make a surprisingly flavorful but simple topping for lean chicken burgers. Tasty & Healthy!!
In a small saucepan over medium heat, bring the first 5 ingredients to a gentle simmer. Remove pan from heat and let cool to room temperature. Add onion rings and stir; then let steep.
Preheat grill to medium-high heat. Meanwhile, in a large bowl, combine minced onion, chicken, bell pepper, garlic, 4 tablespoons hoisin sauce, breadcrumbs, sesame seeds, ginger, and soy sauce. Form the mixture into 4 patties.
Brush grates with oil, and grill burgers for about 4 minutes; flip and repeat, brushing with remaining hoisin sauce during the last minute. Meanwhile, strain and reserve pickled onions, discarding liquid. Assemble burgers on buns, with lettuce and reserved pickled onions.