Take a pressure cooker, add 2 tbsp oil and heat it.
Add the chopped onions and saute/mix.
Add 3 green chillies, curry leaves, saute until the onions turn soft.
Add ginger garlic paste, saute for few minutes to get rid of the raw smell.
Add mutton pieces into the cooker, roast the mutton until the color of the mutton changes.
Add chopped tomatoes, add salt to taste, turmeric powder, mix and cook until the tomatoes turn soft.
Add the blended masala paste from the jar, also add water into the jar and add the left over paste into the cooker.
Give a mix.
Cook the masala until oil leaves the sides.
Add about 2 cups of water, stir.
Check for salt consistency and add more if required, add freshly chopped coriander leaves, mix well.
Secure the pressure cooker lid.
Give whistles to cook the mutton, one whistle on high flame and two on low flame or until mutton tenderizes.
Switch off the flame and reduce the steam naturally.
Open the lid, add a pinch of garam masala and stir.
Cook for 2-3 minutes on low flame.
Switch off the flame, mix and serve hot.
Serve hot with rice or roti.