Ingredients

Mangoes - 2 Cut into small square pieces
chili pwd - 4 T
salt - 3T
Asafoetida - 1/2 teaspoon
Turmeric pwd - 1 teaspoon
Mustard seeds - 1/2 teaspoon
Oil -1 T

Method

Heat oil in a pan. To that add mustard seeds. When it pops reduce heat to low and add chili pwd, salt, asafoetida, turmeric and stir fry about 3 min. Turn off the heat. Let it cool for a while.

Add this mixture to the cut mangoes and mix thoroughly. Keep this for 7-8 days for the flavour to seep into mangoes. You can add a little bit of distilled vinegar if you like. It will help to keep the freshness.
Source: Hem Ramachandran