Orzo chickpea soup

Name: Orzo & chickpea soup
Ingredients: 2 tbsp olive oil; 1 onion, chopped; 2 carrots, chopped; 2 celery sticks, chopped; 2 tbsp tomato purée; 3 garlic cloves, chopped; 3 rosemary or thyme sprigs; 1 litre vegetable stock; 400g can chopped tomatoes; 400g can chickpeas; parmesan rind or vegetarian alternative (optional); 150g orzo; extra virgin olive oil, to serve