Heat oil in a wok over medium heat.
Saute onion in it until light golden.
Remove from the oil.
In the same oil, add ginger garlic paste with mutton, fry well for 10 minutes or until meat is no longer pink.
Add black pepper, coriander, yogurt, salt and green chilies with ½ cup water.
Cover the pot and cook meat until mutton is half done. Now add coarsely grounded brown onion with small cubes of potatoes
Add 1-½ cup water, cover and cook on medium flame for 20 minutes or until potatoes and onion tender.
Put it on dum for 10 minutes or until oil comes on top. Take it out in a serving bowl.
Garnish with chopped coriander, green chilies, ginger julienne. Afghani Aalu Gosht is ready to serve.