Turn on the Instant Pot and select the "Sauté" mode. Heat 2 tablespoon butter in the pot. Add chopped onions. Sauté until they turn translucent.
Add ginger garlic paste, and sauté for another minute. Now, add bell pepper and sauté for a couple of minutes.
Add chopped tomatoes and cook until they soften. Next, add pav bhaji masala, Kashmiri chilli powder, red chilli powder, turmeric powder, and salt. Sauté for a minute. Add the vegetables and mix well.
Finally, add water. Give everything a good mix. Close the Instant Pot lid and set it to "Pressure Cook" mode for 7 minutes.
Once the cooking cycle is complete, let the pressure release naturally. Open the lid and use a potato masher to mash the vegetables until they're well combined and slightly chunky. Adjust the consistency by adding more water if needed.
Turn on the "Sauté" mode again and let the pav bhaji simmer for a few more minutes, stirring occasionally. Top the Bhaji with coriander leaves and 1 tablespoon butter.
Bhaji is ready to be served.
Toast the pav buns with butter on a griddle or skillet.
Serve the hot pav bhaji with buttered pav buns. Sprinkle chopped coriander leaves, chopped onion, and some lemon juice. Enjoy your delicious homemade Instant Pot Pav Bhaji recipe.