This light and refreshing salad is a perfect way to enjoy asparagus and salmon together. Start by grilling or baking a salmon fillet until it is cooked through. Blanch asparagus spears until they are tender-crisp, then toss them with mixed greens, sliced red onion, and a simple vinaigrette made with olive oil, lemon juice, and Dijon mustard. Top the salad with the cooked salmon and a sprinkle of fresh herbs.