Clean and grate the mushrooms and cut them into bite-sized pieces. Peel garlic and dice finely. Cook spaghetti in boiling salted water for about 8 minutes. Heat oil in a coated pan.
Sauté the mushrooms in it. Add garlic and fry briefly. Deglaze with 300 ml water, stir in broth, bring to the boil once and simmer for about 5 minutes at low heat. Wash, clean and dice the tomatoes.
Wash the rocket, dab dry, clean and put something aside for garnishing. Cut the rest roughly. Drain the pasta and let it drain. Add noodles with tomatoes and rocket to the mushroom stock and mix in.
Season to taste with salt and pepper. Sprinkle with parmesan. Garnish with set aside rocket and serve.