Roughly cut the aubergines, peppers and courgettes.
Heat up a large pan with 2 tablespoons of olive oil, add the chopped aubergines, season them with a pinch of salt, and cook them for 4-5 minutes shaking the pan regularly until they are soft and lightly golden.
Remove them from the pan, add 2 more tablespoons of oil, and cook the courgettes for 3-4 minutes.
Remove them from the pan, add more olive oil, and cook the peppers for 3-4 minutes.
Remove them from the pan, and add the remaining oil.
Fry the peeled and chopped onion and garlic until golden, then add the tomatoes cut in half.
Place a lid on the pan, and leave the tomatoes to cook for 3-4 minutes or until mushy.
Add all the vegetables back to the pan together with the bay leaf, and reduce the heat to low.
Leave the stew to simmer for 15 minutes, stirring occasionally.
Season with salt and pepper, add the herbs and serve then dish hot or cold.