For the tagliatelle in porcini cream sauce, first soak the dried porcini mushrooms in lukewarm water for about 20 minutes. The mushrooms should be covered.
Cook tagliatelle in salted water until al dente, strain and rinse. Chop the onion, sauté in a little olive oil.
Remove the dried porcini mushrooms from the water, drain well and add to the onion, fry briefly, dust with flour, pour in mushroom water, thicken with liquid whipped cream. Add herb salt, pepper, crushed garlic and freshly chopped herbs and bring to the boil.
Finally, fold the whipped cream into the tagliatelle in porcini cream sauce. Put the pasta in a plate and serve with plenty of sauce and Parmesan.