Peel, wash and cut koorka into small pieces and soak it in normal water for about 15 minutes.
Cook these koorka pieces for about 10 minutes in medium flame and then dry off water completely.
Heat oil in a cheenachatti/frying pan, add the Koorka pieces into the hot oil and fry them well.
When colour of the Koorkka pieces turns into golden brown, put off the stove and take the pieces out from the oil. Keep aside.
Heat some oil again and then add the green chilli pieces, ginger pieces and add curry leaves. Stir well.
When colour of the ingredients turn into golden/brown, add turmeric powder, red chilli powder, fenugreek powder and required quantity of salt. Then add the fried Koorkka pieces kept separately and stir it further. After about 5 minutes, add Asafoetida powder.
Finally, add required quantity of vinegar and stir it further and put off the stove. Koorka (Chinese Potato) Achar is ready.
The pickle can be served with rice or porotta.