Put the noodles in plenty of boiling salted water and cook for about 10 minutes
Finely dice onion and garlic. Wash and slice the zucchini. Cut tomatoes into quarters, remove seeds and dice flesh very finely. Wash thyme and chop finely. Heat oil.
Sauté onion and garlic. Steam zucchini briefly. Deglaze with 6-7 tablespoons of water and milk. Bring to the boil and stir in the stock. Add tomato and thyme. Season with salt and pepper. Let simmer for about 2 minutes. Stir in mustard. If necessary thicken the sauce.
Season with salt and pepper. Let simmer for about 2 minutes. Stir in mustard. If necessary thicken the sauce. Drain the pasta and serve with the zucchini-mustard sauce. Sprinkle with cheese and serve