Peel, wash and slice the carrots. Wash and clean the zucchini. Halve the zucchini lengthwise and cut into pieces. Drain the beans in a sieve. Peel and chop onions and garlic.
Wash, clean and roughly dice the tomatoes. Heat the oil in a pot and fry the zucchini for 2-3 minutes while turning. Add onions and garlic and fry briefly. Add tomato paste and sweat. Add tomatoes, deglaze with broth.
Add carrots to the stock, bring to the boil and cook over medium heat for about 8 minutes. Cook pasta in boiling salted water according to package instructions. Wash parsley, shake dry and cut into fine strips.
Wash the thyme, dab dry, and except for a little garnish, dab off the leaves. Drain the pasta. Add beans, thyme, parsley and Italian herbs to the soup and season with salt, pepper and sugar.
Simmer at medium heat for about 4 minutes. Add the pasta and lemon zest 1 minute before the end of the cooking time. Arrange soup in bowls, garnish with thyme. Add sliced parmesan.