Wash and steam the nellikai or amla for atleast 10 minutes.
Once they have steamed, switch off the heat, allow it to cool. Deseed and keep aside.
Heat a pan, add oil. Once the oil heats, add mustard seeds and allow it to crackle, add hing or asafoetida.
Add the amla pieces and saute for a couple of minutes. Then add turmeric powder and red chilli powder along with salt to taste. Mix well.
Since Amla is pre-cooked, it would take 7 to 10 minutes for the pickle to be ready.
Switch off flame, add the roasted methi powder, mix well. Once cool, transfer to a clean, dry glass jar.