Add coriander leaves, mint leaves, green chilies, ginger, garlic, cumin powder, lemon juice, chaat masala, and salt with 1 or 2 tablespoon of water and grind it to a smooth paste. Taste the chutney at this point and adjust the ingredients to your liking.
2 to 3 Green chilies, 2 Garlic cloves, ½ inch Ginger, 1 teaspoon Roasted cumin powder, 1 tablespoon Lemon juice, ½ teaspoon Chaat masala, ½ teaspoon Salt or Black salt