In a mixer blender take raw mango dices , coconut , chilly and salt . Grind to a smooth paste adding required amount water .Transfer to a bowl .
In a small kadai prepare a tempering . Add oil . When its hot , add mustard seeds and split black gram . When it splutters add curry leaves ,hing and switch. pour the tempering on chutney .
Tangy spicy simple raw mango chutney is ready to serve. Relish it with dosa / idli / mix it with plain rice etc .. whichever way .. i am sure you will say " Yummy Says my Tummy "
Notes
If you want you can add some coriander leaves to this chutney while grinding . But i won't as i feel it will take over mango flavor .
Few raw mangoes will be too tangy . So taste test before you add .