Place a large pot on medium-high heat and add 6 tbsp of oil. Allow to heat up and a minute later add the aubergines and sauté until nicely browned and softened. Remove from fire to a plate and keep aside.
In the same pot add the remaining 3 tbsp of oil over medium-high heat and allow to heat up. Add the onions, fennel and the carrots along with the chili flakes and sauté for 4’ to soften. Then add the garlic and sauté for a minute or so. Add the tomato paste and cook for a minute or so.
Drop in the courgettes, potatoes and sweet potatoes along with the tomatoes, bring in the aubergines, add all the herbs, season with the salt and pepper and pour the vegetable broth making sure that everything is covered with the broth. Increase the heat with the lid on and bring to a boil. Simmer for 40’ and 5’ before removing from the heat add the parsley.