There is a kind of small plane for peeling ginger in the market. (Hardware products are commonly used in kitchens) Wash the lotus root. Use this small plane to plane the lotus root into minced lotus root. Then wrap the lotus root powder with a piece of gauze and gently rub it in water. A very molten pulp will be considered, and the residue left in the gauze is very coarse and large (not used). After the paste is precipitated, the water is filtered out, and then it is dried in the sun. When it is dried, it becomes lotus root starch. If the quantity is large. You can buy a crock with a rough interior (bowls are sold locally and plates are sold in places). Wipe the washed lotus root repeatedly in the rough place of the crock, and it will soon be rubbed (ground) into lotus root powder. Then filter and dry in the sun by the above method. This method can also be used to make sweet potato (sweet potato) powder. Yam powder. Pea powder. If you have an electric fruit juicer at home. It can also be used to make lotus root starch, sweet potato powder and so on. But be sure to cut the washed lotus root or sweet potato into small pieces before mincing. Drain the water in the above way and dry it in the sun.