Shiraataki are translucent, gelatinous Japanese noodles made from the corm of the konjac plant. They are part of traditional Japanese cuisine, but they are also valuable to people with allergies or intolerances to wheat, gluten or eggs, or, for their low caloric value, to people restricting their energy intake by dieting. Shiraataki Penne Pasta come in dry and soft "wet" forms in Asian markets and some supermarkets. When purchased wet, they are packaged in liquid. They normally have a shelf life 18 months. Some brands require rinsing or parboiling, as the water in the packaging has an odor some find unpleasant. The Penne Pasta can also be drained and dry-roasted, which diminishes bitterness and gives the noodles a more pasta-like consistency. Dry-roasted noodles can be served in soup stock, sauce, or noodle soup.