Turn the broiler of your oven on and line a baking sheet with foil.
Place salmon on the foil and sprinkle with salt and pepper. Broil fish about 4-5 inches from the heat for approximately 10 minutes per inch of thickness. Thinner steaks take between 5-8 minutes. When salmon is golden brown on top, remove and set aside to cool.
Once cooled, break apart and place in a large bowl. Add cucumber, tomato, celery and green onions and set aside.
Place dressing ingredients in a small food processor or blender and pulse until smooth. Pour over top of vegetable mixture.
Sprinkle salad with fresh parsley and mustard seeds.
Serve on a bed of greens, as a sandwich filling, or straight up!