Wash and cut the tomatoes into quarters. You can remove the seeds if you want. Removing the seeds give the gravy a smoother texture.
Peel the onions and cut into quarters.
Wash, peel and dice the ginger. Peel and keep aside the cloves of garlic. To a pressure cooker, add the tomatoes, onions, ginger, garlic, red chillies, and bay leaves. Add a small cup of water.
Close the lid and allow for 2 whistles to come through. (This should be done in 5-7 minutes)
Allow the pressure to completely come down and let the ingredients in the pressure cooker cool down as well.
Remove the skin of the tomatoes and add it to the mixer jar for making the gravy.
Take out all the cooked onions, garlic, ginger, red chillies and add it to the mixer jar.
Do not add the bay leaves or the remaining water from the cooker.
Grind the ingredients into a smooth puree. Your Tomato Onion gravy is ready.