Set a large pot (at least 6 quarts/6 l) of cold water to boil. When it comes to a rolling boil, add the salt and let the pot return to a boil. Add the tagliolini and cook until al dente, according to the package instructions if you are using dried pasta; check periodically for doneness.
While the pasta is cooking, begin warming plates in the oven and prepare the sauce. Melt the butter o