Orzo & chickpea soup

Name: Orzo & chickpea soup
Prep time: 20 min
Cook time: 1 h
Total time: 1 h 20 min
Cuisine: European, Mediterranean
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