1) Heat the oil in a large saucepan and cook the onion and garlic for a couple of minutes. Add the peppers and chilli peppers to the pan and cook for another few minutes, stirring occasionally.
2) Stir in the stock, passata, sweet chilli sauce and both tomato purees.
3) Add the kidney beans to the pan and bring to the boil. Reduce the heat, cover and simmerk for 30 minutes. Blend in batches and then reheat. Serves 4.