Heat the sunflower oil in a pan. Add the onion, garlic, leek, carrot and zucchini and sauté for 3 minutes. Add the minced meat and sauté for a few minutes until browned. Add the tomatoes, paste, parsley and vegetable stock. Bring to a boil, reduce the heat, cover and simmer for 15-20 minutes.
Meanwhile, cook the pasta in plenty of boiling water following pack instructions. Drain pasta, mix with the Bolognese and serve in bowls.