Koorka Thoran/Chinese Potato Stir Fry

Few days back my Hubby when returning from his office came home holding 2-3 covers.One of his colleagues had come from India,Kerala and gave some sweets,homemade pickles and one cover had these hairy root veggie...Koorka/Chinese Potato.In India I used to see these only in the town part groceries but have heard its a very common veggie in other parts of Kerala.No one from our family is into cooking this vegetable,so far I haven't heard anyone say about this either from my family members or my Hubby's side.