Make extra to put in the refrigerator and have salads tomorrow night.
1 cup packed brown sugar
3/4 cup ketchup
3/4 cup reduced-sodium soy sauce
1/3 cup sherry or chicken broth
2-1/2 teaspoons minced fresh gingerroot
1-1/2 teaspoons minced garlic
24 boneless skinless chicken thighs (about 5 pounds)
In a small bowl, mix the first six ingredients. Reserve 1-1/3 cups for basting; cover and refrigerate. Divide remaining marinade between two large resealable plastic bags. Add 12 chicken thighs to each; seal bags and turn to coat. Refrigerate for 8 hours or overnight.
Drain and discard marinade from chicken.
Grill chicken, covered, on an oiled rack 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.