Chunky Bean and Vegetable Soup

2 T. olive oil
2 celery sticks, chopped
2 leeks, sliced (how to)
3 carrots, sliced
2 garlic cloves, crushed
14 oz. can chopped tomatoes with basil
5 c. vegetable broth
14 oz. can cannellini beans, drained
1 T. pesto
salt and pepper

Heat olive oil, cook celery, leeks, carrots, and garlic until softened
Stir in tomatoes and broth
Bring to the boil, cover, cook gently for 15 minutes
Stir in beans and pesto, salt and pepper, cook for 5 minutes