Heat the oil in the casserole dish. Saute all the ingredients, except the celery leaves, beans, tomato puree, stock cube and 2 of the thinly sliced spring onions. Add the water, salt and the stock cube. Cook for 30 minutes over a low heat. Add the beans, celery leaves (snipped), tomato puree and reserved spring onions 5 minutes before the end of cooking. Serve.
Notes
Joan added a bell pepper, vegan sausage and an extra can of beans.