Heat some oil in a pan add the roughly chopped veg and garlic, put a lid on, turn down low and cook for a few minutes. Add the tomatoes and cook up for about 5 mins with the lid off. Add the beans and chestnuts, turn down the heat and leave for a few minutes. It should not be too thick add a splash of water if it is. Just before serving throw in the fresh herbs (any will do, flat leaved parsley, basil, whatever you can get hold of)