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.
serving size = 1/2 recipe