Purple yam also known as ratalu, kand and it’s not sweet potato. Considering it’s purple color , rich in antioxidants. It has bland but creamy taste . You will need fresh one to make this puri or Bhajiya .
Slice fresh yam and dip in chickpea flour batter. What is unique here now is add some crushed black pepper and coriander seeds. Then deep fry.
If you make zucchini or any other kind of fritters then just use that batter and most of the ppl will have black peppers.