1. Preheat broiler with oven rack 6 inches from heat. Snap off tough ends of asparagus. Cut asparagus into 1-inch-long pieces, and cook with sugar snap peas in boiling salted water 2 to 3 minutes or until crisp-tender; drain. Plunge into ice water; drain.
2. Sprinkle salmon with salt and pepper; broil on a lightly greased rack in a broiler pan 3 to 4 minutes or to desired degree of doneness.
3. Arrange lettuce, edamame, radishes, asparagus mixture, and salmon on a serving plate. Drizzle with dressing.