Chop the raw mangoes into small pieces.
Sprinkle 1 tbsp salt over the mango pieces. Mix well.
Chop the green chillies into small pieces.
Heat oil in a pan and fry the asafoetida piece.
Remove kayam from oil and powder it.
In the remaining oil, splutter mustard seeds.
Add the chopped green chillies and fry. Keep the flame to the lowest level.
Add the chilly powders and fry.
Add fenugreek powder and crushed and powdered asafoetida.
Add 3 glasses of boiled water and required salt.
Add the chopped mango pieces and boil.
Add vinegar. After boiling starts, add required salt and put off the flame.
Manga Achar is ready. After the pickle has cooled down, store in air tight containers.