1. Arrange an oven rack in center of oven, and preheat broiler.
2. Combine the first 5 ingredients (through brown sugar) in a bowl.
3. Place a layer of aluminum foil on a baking sheet or broiler pan, and coat with cooking spray. Place salmon on foil, and brush with half the soy glaze. Broil 3 minutes; remove from oven, and brush with remaining glaze. Broil 3 minutes more or until salmon is flaky.
4. Combine miso, mirin, and orange juice in a blender. Boil edamame in lightly salted water for 3–4 minutes or until tender; drain, reserving 4 tablespoons cooking liquid. Add edamame, reserved water, and salt to blender; pulse. Arrange 1/3 cup purée on each of 4 plates. Top with 1 piece of salmon, and drizzle with 1/4 teaspoon soy glaze from baking sheet. Garnish with orange zest.