Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2                    mangoes - cut into small square pieces
   4      tablespoons   chile powder
   3      tablespoons   salt
     1/2  teaspoon      asafetida
   1      teaspoon      turmeric powder
     1/2  teaspoon      mustard seeds
   1      tablespoon    oil

Preparation:

Heat oil in a pan. To that add mustard seeds. When it pops reduce heat to low and add chile powder, salt, asafetida, 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 flavor 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