Pasta and Tuna Salad with Zucchini and Sundried Tomato Pesto

Ingredients

• 250 g pasta twists or spirals (such as fusilli or rotini, or other shapes)
• 2 tbsp extra virgin olive oil
• 1 onion (chopped)
• 1 garlic clove (chopped)
• 2 zucchinis (thinly sliced)
• 2 tsp caster (superfine) sugar
• 2 tbsp sundried tomato pesto
• 1 tbsp white or red wine vinegar
• 2 tbsp capers
• 6 tomatoes (skinned, halved and cut into thin wedges)
• 1 170g can tuna in water (drained and roughly flaked)
• 6 black olives (not oil-packed) (pitted and halved)
• fresh Italian parsley (to garnish)