Wash and cut the mango into small pieces, with or without the peel, discarding the seed.
Add salt and green chillies and mix well. Keep for one day.
In a small kadai heat oil.
Once hot, add in the mustard seeds and allow them to splutter.
Add in gingervgarlic paste and saute till light brown.
Add in turmeric powder, red chilly powder, asafoetida powder and fenugreek powder.
Stir and add curry leaves(if required salt can be added). Take it off the flame.
Add the seasoning to the cut mangoes and mix well.
9)Add vinegar and then mix well.