In a medium sized bowl, whisk together pineapple juice, soy sauce, brown sugar, ketchup, chicken broth, ginger and garlic. Reserve 1 cup sauce for basting. Add the chicken thighs and sauce to a ziplock bag and marinate at least 3 hours or overnight.
Grill chicken, covered, over medium heat for 6-8 minutes on each side or until no longer pink. Baste occasionally with reserved marinade during the last 5 minutes. Garnish with green onions if desired
