Heat the oil in a large saucepan, add the onions, garlic and peppers and cook gently for 5 minutes.
Add the courgettes, aubergines and tomatoes. Stir then cover and cook over a low heat for 20–25 minutes until the vegetables are tender.
Season to taste with salt and pepper and stir in the chopped parsley.
Serve hot with Mevalia Penne