There are several ways you can cook lotus root: Steam: You can steam lotus root slices. This usually takes about 15-20 minutes, but the time may vary depending on the thickness of your slices. To test for doneness, insert a fork or knife into the lotus root; it should pierce easily. Boil: Follow the same process as steaming. For a more al dente finish, check the tenderness at the 12-minute mark. Fry: Like potatoes before roasting, you can parboil the lotus roots for 5 minutes and then add to the frying pan to finish. This results in a more even finish across the vegetable.