Prepare the Herb Vinaigrette, and set aside. Preheat the oven to 350 degrees F.
Sprinkle the salmon fillets on both sides with the salt and pepper. Spread the mustard on both sides of each fillet, dredge them in the chopped herbs, and press the herbs onto the fillets with your hands.
Heat the butter or oil in a 10-inch, ovenproof, nonstick skillet over high heat until very hot. Place the salmon fillets in the skillet and cook for about 1 minute per side, turning carefully so not to damage the herb crust. Place the skillet in the oven and roast for about 5 minutes for medium, 10 minutes or longer for well done.
While the salmon is baking, prepare the Warm Greens.
To serve, place 1 serving of the greens on each plate, top with a salmon fillet, and drizzle with additional vinaigrette.
Yield: 4 main-course servings