Turn Instant Pot to sauté(more) mode and heat oil. Add mustard seeds and allow them to crackle. This may take 2-3 minutes. Add asafetida, turmeric, jalapeños, green tomatoes, and salt.
Give a quick stir. Add brown sugar. Close Instant Pot with pressure valve set to sealing.
Pressure Cook (low pressure) for 5 minutes followed by quick release or natural pressure release.
Open Instant Pot and set to sauté mode. Mash the tomatoes using a masher, cook for 2 minutes stirring frequently. Garnish with chopped cilantro. Mix well and enjoy!
Notes
Stovetop Instructions
Heat oil in a saucepan over medium heat. Once hot, add mustard seeds and let them crackle (about 2 to 3 minutes).
Add a pinch of asafetida, turmeric, chopped jalapeños, chopped green tomatoes, and salt. Stir well.
Add brown sugar and mix. Cover the pan with a lid and cook on medium-low heat for 10 to 15 minutes, or until the tomatoes are soft and fully cooked. Stir occasionally.
Once the tomatoes are cooked, mash them gently with a masher. Continue to cook uncovered for another 2 to 3 minutes, stirring frequently, until the chutney thickens.