Prepare the Chilli-Garlic Paste: In a mixer grinder, add the green chillies and peeled garlic cloves. Pulse them to form a coarse paste. (You can also add half a teaspoon of cumin seeds here if you like.)
Heat the Oil: Place a pan on the stove over medium heat and add 2 teaspoons of oil. Let it get nice and hot.
Temper the Spices: Add the mustard seeds and cumin seeds to the hot oil. Once they crackle, add a pinch of asafoetida (hing) and the chopped curry leaves.
Sauté the Onion: Add the chopped onion to the pan and sauté until it turns light golden and soft.
Cook the Paste: Lower the flame slightly and add the coarsely ground chilli-garlic paste. Sauté this mixture for about 1 minute until the raw smell disappears.
Add the Raw Mango: Turn the heat to low. Add the grated raw mango and salt to taste. Mix well and cook for just 1 minute.
Add the Crunch: Toss in the coarsely crushed roasted peanuts. Mix everything well so the peanuts absorb the flavours.
Garnish and Serve: Finally, add the freshly chopped coriander leaves (and mint if using). Mix well, turn off the heat, and your tangy Raw Mango Chutney is ready to serve!