In medium mixing bowl, combine shrimp, mango, celery and onion. Season to taste with salt and pepper. Toss with 1 tablespoon raspberry dressing. Gently fold in raspberries. Center each avocado half on chilled salad plate.
Divide raspberry shrimp mixture among avocado halves, filling to overflowing.
Serve extra dressing on the side. Makes 4 servings. Gradually blend in oil until smooth. Season to taste with salt and pepper. Refrigerate any remaining dressing.