Heat oil in sauté pan and fry onions for 4 minutes on a medium heat. Stir only if needed to avoid sticking. Add garlic, stir gently and cook a further 2 minutes.

Add the peppers and cook for a further 5 or so minutes until the vegetables are softened, stirring occasionally. Set aside.

Add a little more oil and gently fry the courgettes and aubergines together for 10 minutes or until softened, stirring occasionally.

Return the onions, garlic and peppers to the pan. Stir gently but thoroughly. Then add the tomatoes, sugar, herbs and seasoning and cook for 15 minutes. Stir and serve.