Press the sauté button, add oil and allow it to heat up for a minute. Add the cumin seeds and mustard seeds and once the cumin seeds brown and the mustard seeds pop, add the onion and bay leaf. Stir-fry for 6-7 minutes, or until the onion begins to brown.
Add garlic, ginger, spices and stir briefly. Add the chicken and give everything a good mix so that the chicken is well coated with the spices.
Add the pureed tomatoes and cook for 5 minutes, stirring occasionally.
Add the potatoes, give everything a good stir, then pour in the water.
Secure the lid, close the pressure valve and cook for 5 minutes at high pressure.
Naturally release pressure.
Garnish with cilantro.