Coat grill with cooking spray; heat on high. Mix peanut butter, vinegar, soy sauce, ginger and garlic in a bowl. Set aside. Mix chicken, onion, cilantro and salt in another bowl; make four 4-inch patties; coat both sides with cooking spray. Grill burgers 7 to 8 minutes, turning once halfway through, until no longer pink in the center. Place burgers on buns; top with sauce.
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