Bring salted water to a boil. Meanwhile cook shallots in butter over very low heat or until tender. Add heavy cream and reduce somewhat or until thickened. Cook pasta for 2 minutes or until al dente and add to cream; toss to coat. Whisk in truffle butter or paste into pasta and remove from heat. Season with salt. Serve with truffle shavings or fresh truffle.
Recipe courtesy of Michele Urvater