Baking potatoes on a layer of salt allows heat to circulate 360 degrees. Scrape the salt into a jar and reuse it again and again. If you do not have time to shape the gnocchi, you can freeze the dough, defrost it in the refrigerator, and then shape it. To freeze shaped gnocchi, line baking sheets with waxed paper and dust with flour. Spread the gnocchi on the prepared sheets and freeze until hard. Remove to individual-portion-size freezer bags. Store in the freezer for up to 1 month. To cook, drop the frozen gnocchi into boiling salted water. Cook for about 2 minutes after they rise to the surface.