We will get manga ginger in Madras.
Get manga ginger from the market. Clean well.
Make small pieces out of it. Cut green chillies also into small pieces.
Now put the two items in a bowl and add lemon juice and salt.
Mix well. Taste it.
If you want to correct the salt or sour you can add them as per your taste.
Mix well and you can use this immediately for curd rice.
Asusual if you keep it in the fridge you can use this manga ginger for a long time.