Marinate the mutton with the lime juice, salt, coriander, cumin, chilli & turmeric powder & the ginger & garlic paste and leave to marinate for 30 mins to overnight
In the Instant Pot or pressure cooker, heat up the regular and mustard oil on saute mode
Add the whole spices and the red chillies
Add the cumin seeds
Add the onion and saute for 5 - 7 mins till golden brown
Add the marinated mutton and saute on both sides
Add salt to taste
Add the tomatoes and water and mix
Cancel saute mode and set the IP to pressure cooker mode for 15 mins
After 15 mins allow the steam to escape and put the IP back on saute mode
Add the vinegar and the potato wedges and make sure the potatoes are covered in the liquid
Cancel saute mode and put the IP back on pressure cooker mode for 10 minutes
Release the steam once done and put the IP back on saute mode
Allow this to boil for a few minutes to thicken up a bit, but first remove and reserve all the potatoes so they don’t over cook
Finally add the coconut milk, chopped coriander and add the potatoes back in