
In a small bowl, whisk together dressing ingredients: 3 Tbsp lemon juice, 3 Tbsp olive oil, 2 Tbsp dill, 1 tsp sea salt and 1/8 tsp black pepper. Stir together and set aside.
Season both sides of salmon filets with 1 tsp garlic salt and 1/8 tsp pepper, or season to taste.
Heat 1/2 Tbsp oil in a large nonstick pan over medium heat. Once oil is hot, add salmon and cook 3-4 minutes per side or until golden and cooked through (cook time can vary depending on thickness of salmon filet). Remove salmon to a plate and spoon 1 teaspoon of the dressing over each filet. Set aside to cool to room temperature.
Arrange salad ingredients in the salad bowl: 6 cups romaine lettuce, sliced english cucumber, sliced radishes, 1/2 cup thinly sliced red onion, and sliced avocados. Drizzle with remaining lemon dressing and toss to combine. Divide between 4 plates and top each plate with a salmon filet.