Prepare the Dijon Citrus Vinaigrette by placing the olive oil, 3 tablespoons of lemon juice, and Dijon mustard together in a small bowl. Season to taste with sea salt and black pepper. Whisk to combine, and set it aside.
Season the salmon filets with salt and pepper. Spoon one tablespoon of the vinaigrette over each piece of salmon and leave to rest for 5 minutes.
Meanwhile, arrange the lettuce, avocado, radishes, cucumber, and dill onto serving plates. Set them aside.
Whisk salad dressing ingredients together in a small bowl and add to each plate of salad.
Heat one tablespoon of olive oil in a grill pan over medium heat. Add the salmon filets and cook for 3-5 minutes per side to the desired degree of doneness.
Add one salmon filet to each salad plate, and sprinkle the salad with blue cheese and sesame seeds if using. Drizzle with remaining Dijon Citrus Vinaigrette as desired. Enjoy!