Salmon: Preheat oven to 400 degrees. Rinse the fish under cold water, and pat dry with paper ­towels. Place one or two cooling racks on top of a parchment- or ­aluminum-foil-lined baking sheet ...

Spoon a quarter of the couscous onto one side of each piece of foil. Top with the green beans and place a salmon fillet on top. Squeeze over the lemon juice ... tray and bake for 15 minutes.