A surprisingly good flavour. I did doubt how it would taste at first, looking at the lack of ingredients being used. I substituted the plum tomato purée with just over half a carton of tomato passata, added sweet potato, an aubergine, garlic cloves (whole) plenty of seasoning and only added three courgettes rather than four. Cooked for two hours (turning the gas up to gas mark 6 after the first hour) rather than 90 mins due to some of the potatoes not quite being done and the dish being slightly larger with added ingredients.
If you are going to make this dish don't substitute the oil for anything less. In my opinion it was the oils left over once cooked that really made this dish. an amazing depth of flavour I really didn't expect.
4 stars due to the fact I wouldn't personally have this as a main dish again, felt more like a side dish to me. Something to serve up when the family are round for a bit of a feast.