Place fillets in a large resealable plastic bag or shallow glass container; cover with salad dressing. Seal bag or cover container; refrigerate for 1 hour, turning occasionally. Drain and discard marinade.
Combine remaining ingredients; mix well. Remove 1 cup for basting. (Refrigerate remaining sauce for another use.)
Grill fillets, covered, over medium hot heat for 3 minutes on each side. Brush with the basting sauce. Continue grilling for 6-8 minutes or until fish flakes easily with a fork, turning once and basting several times.