Slice Avocado into 8 wedges. Arrange equal amounts of Avocado and Grapefruit on 4 salad dishes and top each with 2 Onion slices. Dress each salad with 1 tablespoon sauce. Food exchanges per serving: 1 fruit exchange + 1 fat exchange; calories: 137, cho: 0 mg; car: 3g; pro: 17 mg; sod: 109; fat: 10g;