Heat the All-Clad 3 Qt. Sautoir over medium low heat. Add the butter, onions and kosher salt. Sweat the onions, stirring frequently until the onions soften. Add the dried pasta and cook, stirring slowly but continuously for about 5 minutes. Add the minced truffle, if you are using them, at this point. Ladle enough very hot chicken stock over the pasta to barely cover it and continue cooking stirring frequently until half of the liquid has been absorbed by the pasta. Taste the pasta to check the texture and add a little bit more stock. Continue doing this until you reach your desired texture and doneness and there is very little liquid left. It is important to continue to stir the pasta gently throughout the process so that all the pasta cooks evenly. Also keep in mind that the amount of stock and time can differ depending on the shape and thickness of different pasta varieties. Once your pasta is cooked to your liking, turn down the heat and vigorously stir in the butter until the pasta is nice and creamy. Stir in the parmesan cheese followed by the whipped cream. Spoon into serving dishes, garnish with additional grated parmesan cheese, and generously shave the truffles over the top, if you are using them, and serve right away.