Heat the oil in a wide non-stick pan over a medium heat and fry the potatoes, pepper and bay leaf for 5 mins until they start to colour. Add the leek and garlic, cook for a few minutes more, then stir in the passata and stock. Bring to a simmer, cover and cook for 25 mins until the potatoes are tender.
Add the parsley, spinach, peanuts and green beans, then put the lid on and cook for about 7 mins more, or until the spinach is wilted and green beans are cooked. Will keep chilled overnight, but best served fresh.