Heat oil in a non-stick frying pan,splutter mustard seeds,fenugreek powder,few curry leaves and then the raw mango pieces and saute them for 5 mins continuously.
Add chilli powder and salt and saute them till done.(if you have pickle powder ,u can add than one 1 tsp when u add chilli powder but it is optional)
That'a all!
Let it cool and store it in an air-tight jar . put it in refrigerator.
It goes very well with rice and sambar or yoghurt.