1. Cook the tagliatelle in plenty of boiling salted water until al dente (about 9 minutes). Drain and reserve a cup of the pasta cooking water.
2. Pour the Parmigiano Reggiano cream over the tagliatelle and mix well. If the sauce is too thick, add a little of the pasta cooking water to make it creamier. Season with salt and black pepper to taste.
3. Sprinkle generously with pecorino truffle powder.
4. Serve immediately, buon appetito