PREHEAT grill to medium heat. Place 1 Tbsp. of the dressing in shallow plate. Place salmon, skin side up, in dressing to coat.
MEANWHILE, mix remaining dressing and the remaining ingredients until well blended; refrigerate until ready to serve.
PLACE salmon, skin side down, on grill. Cover grill. Grill 10 min. or until salmon flakes easily with fork. Serve topped with sour cream mixture.
