1. Peel the lotus root, wash, cut into pieces, and put it in the pressure cooker.
2. Wash the spine and put it in the pressure cooker.
3. Add water to the pressure cooker to submerge all the ingredients.
4. Do not cover the pot, boil, and skim the floating powder.
5. Then put on the lid of the pressure cooker, turn the fire to medium and low heat for 20 minutes when the high-pressure gas ZI ZI is ignited.
6. When the high-pressure gas escapes naturally, open the lid of the pot, put a proper amount of salt, turn on the fire again, and bring it to a boil to let the salt melt.
