Cook the spaghetti in salted water according to the package instructions. In the meantime clean, wash, slice or plane the zucchini. Wash the fillet, dab dry, cut into smaller pieces. Heat oil. Fry the fillet for 3 minutes over high heat, turning it over. Season with salt and pepper and put aside. Add zucchini to the frying fat and fry for 2 minutes.
In the meantime wash parsley and cut into strips. Add parsley and lemon peel, deglaze with broth and cream, bring to the boil. Melt cream cheese in it. Add fillet again. Season to taste with salt and pepper. Arrange spaghetti with fillet and zucchini in sauce in portions. Serve garnished with fresh herbs