Wash the tomatoes and make a small crosscut on the top of each one. This helps heat enter the tomatoes evenly.
Arrange a wire rack or griller over an open flame or stove. Place the tomatoes, garlic bulbs, and green chilies on the rack.
Begin roasting all ingredients. Green chilies will char and soften very quickly, usually within 1 to 2 minutes, so remove them first once they blister.
Continue roasting the garlic bulbs until the outer layers are charred and the inside becomes soft. This generally takes a few minutes longer than the chilies.
Tomatoes take the longest to roast. Keep turning them until the skin is completely charred and the tomatoes feel soft and slightly collapsed. Remove them once done.
Transfer all roasted ingredients to a bowl and cover it for 15 minutes. This steaming step helps the skin loosen and makes peeling easier.
Peel the charred skin from the tomatoes. Remove the garlic cloves from the bulbs and peel them. Trim the roasted chilies and chop them roughly.
In a stone mortar add cumin seeds and crush them until they break and release aroma.
Add chopped ginger, roasted chilies, and peeled garlic. Pound everything together to form a coarse paste.
Add the peeled roasted tomatoes to the mortar and crush them gently into the mixture. Keep the texture rustic and chunky.
Add salt and 1 teaspoon Kashmiri red chili powder. Mix well.
Heat 1 to 2 tablespoon mustard oil in a pan. Add a pinch of hing, then add the pounded tomato mixture.
Cook for 1 to 2 minutes on medium heat to blend the flavors. Do not overcook.
Switch off the flame. Add fresh chopped coriander leaves and mix. Your rustic roasted tomato chutney is ready.
Serve with bajra roti, paratha or use as a dip with snacks or spread on sandwiches or wraps or enjoy as a side with rice and dal