Grind together all the ingredients for the masala paste using as little water as possible
Marinate the mutton in salt and set aside for 30 minutes
In a pressure cooker, add the oil and sauce the onions until soft and translucent.
Add the masala paste as well as the mutton and sauce for 5 - 10 mins until the mutton has been browned.
Add in a cup of water, close the pressure cooker and cook for 3 whistles and 15 minutes on slow until the mutton is tender.
While the mutton is cooking, peel the guavas, remove the seeds and cut them into thick wedges. Set aside.
Once you have opened the cooker, add in the guavas and simmer the curry for a further 5 - 10 minutes until the guavas are soft.
Turn the heat on low and add in the coconut milk to form a thick curry. Adjust the salt if need be.
Once the curry has reached your desired consistency and the guavas are cooked, turn off the heat. Squeeze in some lemon juice and you are good to go!
Serve hot with steamed rice and some kachubar on the side.