Preheat oven to 450˚F. Line a sheet pan with foil and spray lightly with cooking spray.
In a medium size pot, bring chicken broth and ½ teaspoon salt to a boil. Add the couscous and reduce the heat to medium-low. Cover and cook until couscous is just tender, 8-10 minutes.
Drain the couscous in a sieve. Drizzle lightly with olive oil and stir with a fork to prevent clumping. Set aside.
While couscous is cooking, prepare salmon. Place salmon fillets on prepared pan spaced 1-inch apart. Season both sides lightly with kosher salt and freshly ground pepper. Drizzle 1 teaspoon of the Lemon Dill Dressing on each fillet. Spread with the back of a spoon to coat the top surfaces.
Bake for 6-10 minutes, until salmon is slightly firm to the touch and the internal temperature of the salmon reaches 125-135°F . Remove from oven and let sit for 2 minutes (the temperature will come up a bit during this resting time).
Flake salmon into large chunks with two forks (see tutorial above). Drizzle flaked salmon with 1-2 tablespoons of the Lemon Dill Dressing and toss gently to coat.
To assemble salad, combine watercress, arugula or baby spinach with the Israeli couscous in a large bowl. Drizzle with 2 tablespoons of the Lemon Dill Dressing.
Turn out couscous mixture onto a large serving platter or individual plates. Top with flaked salmon, tomatoes and Feta cheese. Drizzle with a bit more dressing and sprinkle genersouly with fresh dill. Serve extra dressing at the table.