Rigataki Zenpasta Rigatoni with Konjac Description: Carbohydrate-free. Rich in fiber. With glucomannan to help lower your cholesterol. Rigataki are a product we created, inspired by the more famous Shirataki, a traditional Japanese dish made from the konjac root. The root contains only one precious dietary fiber: glucomannan. Other plant fibers are added to Rigataki to achieve a consistency and color similar to whole-wheat pasta