Preheat a grill, broiler or grill pan.
Brush the salmon with a film of vegetable oil and grill, broil or pan-broil for about 4 minutes per side or until cooked but still rare.
Remove the fish from pan to a cutting board and cut into chunks and set aside to cool slightly.
Cook the couscous until al dente, drain and place in a large bowl. Add the peas, cheese, scallions, cranberries, orange peel, dill and mint. Toss gently to distribute the ingredients evenly.
In a small bowl mix the vegetable oil, lemon juice and orange juice. Pour over the ingredients and toss. Season to taste with salt and pepper.