Preheat oven to 400 degrees. Grease a baking sheet.
Toss tomatoes and onions with 2 tablespoons of the olive oil and salt & pepper in a medium bowl. Spread on baking sheet and roast for 25 minutes, tossing occasionally.
While tomatoes & onions roast, combine couscous, herbs and spices in a medium bowl.
In a separate small bowl, whisk together lemon juice and remaining olive oil.
Once tomatoes & onions are roasted, combine with couscous and herbs.
Season with salt & pepper to taste.
Pour dressing over salad and toss to combine.
Lastly, fold in feta crumbles.
Adjust seasoning to taste and garnish with extra basil or mint if desired.