Orzo & tomato soup

Name: Orzo & tomato soup
Prep time: 5 min
Cook time: 25 min
Total time: 30 min
Cuisine: European, Italian, Mediterranean
Ingredients: 2 tbsp olive oil; 1 onion,chopped; 2 celery sticks,chopped; 2 garlic cloves,crushed; 1 tbsp tomato purée; 400g can chopped tomatoes; 400g can chickpeas; 150g orzopasta; 700ml vegetable stock; 2 tbsp basil pesto; crusty bread,to serve