Set the pot to sauté and add the oil.
Add the chilies, cardamon pods, cloves, cumin seeds, fennel seeds, mustard seeds and chili flakes. Toast for a few seconds before adding the onions.
Fry the onions until softened (around 5 minutes) and then add the ginger and garlic.
Add the dried spices and season to taste.
Now add the chicken and coat with the onion mixture.
Add the tomatoes, lemon juice and water. Stir together and deglaze the pot if necessary.
Now add the tomato purée. DO NOT STIR.
Put the lid on and set to high pressure for 8 minutes. When the time is up, leave under pressure for another 8 minutes and then do a quick release.
When the pin drops, remove the lid and set the pot to sauté. Leave the curry simmering until it reaches the consistency you require (I left it for 5 minutes).
Serve with boiled rice or Naan bread garnished with the coriander and enjoy..