Roasted Vegetable and Cous Cous Salad

1. Preheat the oven to 200C/ 400F/Gas Mark 6. 2. Halve and deseed the peppers, and cut into thick wedges. Place on a large baking sheet. Peel the onion and cut into thick slices, toss in the lime juice and then place on the baking sheet. 3. Peel the garlic, slice thinly and sprinkle over the vegetables. Drizzle with 1 tbsp olive oil. Bake in the oven for 25 minutes. Meanwhile quarter the tomatoes. Turn the vegetables and lay the tomatoes on top. Return to the oven and continue to cook for a further 5 minutes until tender. 4. Soak the cous cous according to the manufacturer’s instructions. Whilst the cous cous is soaking, make the dressing by mixing all the ingredients together. Season with black pepper to taste. 5. Drain the canned vegetables and transfer to a heatproof bowl and mix in the cous cous. Add the drained roasted vegetables and the flaked tuna. Pile the cous cous salad on to serving plates and spoon over the dressing.