Clean the mushrooms and cut them in half or quarters depending on their size. Peel and finely chop the onion. Peel garlic and chop finely. Wash rosemary, shake dry, pluck needles from the twigs and chop finely.
Heat the oil in a wide saucepan. Sauté the mushrooms in it while turning them. Add onion and garlic and fry briefly. Season with salt, pepper and paprika.
Add the tomato paste and sauté briefly while stirring. Deglaze with 900 ml water and cream. Add spaghetti, bring to the boil, stir in broth, cover and cook over medium heat for 25-30 minutes. Stir frequently.
Season spaghetti again with salt, pepper and paprika. Peel parmesan with a peeler to form chips. Garnish pasta with Parmesan shavings and basil as desired.
Tip: Do not forget to stir! Stir the spaghetti well from time to time so that they absorb the liquid evenly and do not stick together.