Combine vinegar, oil, mustard and Mrs. Dash® Chicken Grilling Blend in jar. Cover and shake until blended. Pour 1/4 cup (60mL) dressing in small bowl, set aside remaining. Place potatoes in shallow microwave-safe dish with 1/4 cup (60mL) water. Cover and microwave on high for 5-6 minutes or until nearly tender, drain well. Place fish, potatoes, asparagus and bell pepper pieces in shallow dish. Pour 1/4 cup (60mL) dressing over, turn to coat salmon and vegetables. Remove salmon and place on foil-lined grilling tray of broiling pan. Grill or broil salmon for 6 minutes.Turn, add potato, asparagus and bell pepper. Continue grilling salmon and vegetables for 5-6 minutes or until salmon steaks flake easily and vegetables are tender. Toss together salad blend and vegetables with reserved dressing in bowl. Line three individual plates with salad. Arrange salmon over each salad.