Method

1. Heat the oil in a large saucepan at medium heat
2. Chop the onion, garlic and green pepper and wash the beans
3. Add the onion and green pepper to the saucepan and cook for 7 to 9 minutes, until soft
4. Add the garlic and cook for 1 minute
5. Add the remaining ingredients and bring to the boil. Reduce the heat, cover with a lid and simmer for 15 to 20 minutes