Method:
Heat 1 tablespoon of the olive oil in a medium saucepan over medium heat. Add couscous and cook, stirring frequently, until toasted, about 5 minutes. Stir in water and salt and bring to a simmer. Cover and simmer until water is absorbed and couscous is just tender, 10 to 12 minutes.
While couscous cooks, whisk together lemon zest, juice, remaining 1/2 cup olive oil, garlic and salt and pepper to taste. Remove 2 tablespoons dressing and set aside for basting.
Preheat a grill to medium-high heat. Grill sausages and peppers, basting with the reserved 2 tablespoons dressing and turning frequently. When sausage is cooked through and peppers are tender, 10 to 15 minutes, remove from grill. Slice sausage into 1/2-inch-thick rounds and peppers into bite-size pieces. Put in a bowl with couscous. Toss with olive oil-lemon dressing and parsley. Taste and adjust seasoning. Serve warm or at room temperature.